diff --git a/admin/backup.php b/admin/backup.php
index d1a0a862..1a4b43e8 100644
--- a/admin/backup.php
+++ b/admin/backup.php
@@ -4,10 +4,10 @@ include 'header.php';
 include 'menu.php';
 
 $actionUrl = $security->getTokenUrl(
-    Typecho_Router::url('do', array('action' => 'backup', 'widget' => 'Backup'),
-        Typecho_Common::url('index.php', $options->rootUrl)));
+    \Typecho\Router::url('do', array('action' => 'backup', 'widget' => 'Backup'),
+        \Typecho\Common::url('index.php', $options->rootUrl)));
 
-$backupFiles = Typecho_Widget::widget('Widget_Backup')->listFiles();
+$backupFiles = \Typecho\Widget::widget('Widget_Backup')->listFiles();
 ?>
 
 <div class="main">
diff --git a/admin/category.php b/admin/category.php
index 97de61df..f73082ff 100644
--- a/admin/category.php
+++ b/admin/category.php
@@ -9,7 +9,7 @@ include 'menu.php';
         <?php include 'page-title.php'; ?>
         <div class="row typecho-page-main" role="form">
             <div class="col-mb-12 col-tb-6 col-tb-offset-3">
-                <?php Typecho_Widget::widget('Widget_Metas_Category_Edit')->form()->render(); ?>
+                <?php \Typecho\Widget::widget('Widget_Metas_Category_Edit')->form()->render(); ?>
             </div>
         </div>
     </div>
diff --git a/admin/common-js.php b/admin/common-js.php
index 467ce54e..fad1cd04 100644
--- a/admin/common-js.php
+++ b/admin/common-js.php
@@ -7,13 +7,13 @@
         $(document).ready(function() {
             // 处理消息机制
             (function () {
-                var prefix = '<?php echo Typecho_Cookie::getPrefix(); ?>',
+                var prefix = '<?php echo \Typecho\Cookie::getPrefix(); ?>',
                     cookies = {
                         notice      :   $.cookie(prefix + '__typecho_notice'),
                         noticeType  :   $.cookie(prefix + '__typecho_notice_type'),
                         highlight   :   $.cookie(prefix + '__typecho_notice_highlight')
                     },
-                    path = '<?php echo Typecho_Cookie::getPath(); ?>';
+                    path = '<?php echo \Typecho\Cookie::getPath(); ?>';
 
                 if (!!cookies.notice && 'success|notice|error'.indexOf(cookies.noticeType) >= 0) {
                     var head = $('.typecho-head-nav'),
@@ -110,7 +110,7 @@
 
                     if ((href && href[0] == '#')
                         || /^<?php echo preg_quote($options->adminUrl, '/'); ?>.*$/.exec(href) 
-                            || /^<?php echo substr(preg_quote(Typecho_Common::url('s', $options->index), '/'), 0, -1); ?>action\/[_a-zA-Z0-9\/]+.*$/.exec(href)) {
+                            || /^<?php echo substr(preg_quote(\Typecho\Common::url('s', $options->index), '/'), 0, -1); ?>action\/[_a-zA-Z0-9\/]+.*$/.exec(href)) {
                         return;
                     }
 
diff --git a/admin/common.php b/admin/common.php
index 28124ea6..597209c4 100644
--- a/admin/common.php
+++ b/admin/common.php
@@ -12,15 +12,15 @@ if (!defined('__TYPECHO_ROOT_DIR__') && !@include_once __DIR__ . '/../config.inc
 }
 
 /** 初始化组件 */
-Typecho_Widget::widget('Widget_Init');
+\Typecho\Widget::widget('Widget_Init');
 
 /** 注册一个初始化插件 */
-Typecho_Plugin::factory('admin/common.php')->begin();
+\Typecho\Plugin::factory('admin/common.php')->begin();
 
-Typecho_Widget::widget('Widget_Options')->to($options);
-Typecho_Widget::widget('Widget_User')->to($user);
-Typecho_Widget::widget('Widget_Security')->to($security);
-Typecho_Widget::widget('Widget_Menu')->to($menu);
+\Typecho\Widget::widget('Widget_Options')->to($options);
+\Typecho\Widget::widget('Widget_User')->to($user);
+\Typecho\Widget::widget('Widget_Security')->to($security);
+\Typecho\Widget::widget('Widget_Menu')->to($menu);
 
 /** 初始化上下文 */
 $request = $options->request;
@@ -33,22 +33,22 @@ if (!empty($currentMenu)) {
     $params = parse_url($currentMenu[2]);
     $adminFile = basename($params['path']);
 
-    if (!$user->logged && !Typecho_Cookie::get('__typecho_first_run')) {
+    if (!$user->logged && !\Typecho\Cookie::get('__typecho_first_run')) {
         
         if ('welcome.php' != $adminFile) {
-            $response->redirect(Typecho_Common::url('welcome.php', $options->adminUrl));
+            $response->redirect(\Typecho\Common::url('welcome.php', $options->adminUrl));
         } else {
-            Typecho_Cookie::set('__typecho_first_run', 1);
+            \Typecho\Cookie::set('__typecho_first_run', 1);
         }
     } elseif ($user->pass('administrator', true)) {
         /** 检测版本是否升级 */
-        $mustUpgrade = version_compare(Typecho_Common::VERSION, $options->version, '>');
+        $mustUpgrade = version_compare(\Typecho\Common::VERSION, $options->version, '>');
 
         if ($mustUpgrade && 'upgrade.php' != $adminFile && 'backup.php' != $adminFile) {
-            $response->redirect(Typecho_Common::url('upgrade.php', $options->adminUrl));
-        } else if (!$mustUpgrade && 'upgrade.php' == $adminFile) {
+            $response->redirect(\Typecho\Common::url('upgrade.php', $options->adminUrl));
+        } elseif (!$mustUpgrade && 'upgrade.php' == $adminFile) {
             $response->redirect($options->adminUrl);
-        } else if (!$mustUpgrade && 'welcome.php' == $adminFile && $user->logged) {
+        } elseif (!$mustUpgrade && 'welcome.php' == $adminFile && $user->logged) {
             $response->redirect($options->adminUrl);
         }
     }
diff --git a/admin/editor-js.php b/admin/editor-js.php
index dfd51317..db2586ff 100644
--- a/admin/editor-js.php
+++ b/admin/editor-js.php
@@ -109,7 +109,7 @@ $(document).ready(function () {
         }
     });
 
-    <?php Typecho_Plugin::factory('admin/editor-js.php')->markdownEditor($content); ?>
+    <?php \Typecho\Plugin::factory('admin/editor-js.php')->markdownEditor($content); ?>
 
     var th = textarea.height(), ph = preview.height(),
         uploadBtn = $('<button type="button" id="btn-fullscreen-upload" class="btn btn-link">'
diff --git a/admin/extending.php b/admin/extending.php
index be228ef0..f2987e9f 100644
--- a/admin/extending.php
+++ b/admin/extending.php
@@ -5,7 +5,7 @@ $panel = $request->get('panel');
 $panelTable = unserialize($options->panelTable);
 
 if (!isset($panelTable['file']) || !in_array(urlencode($panel), $panelTable['file'])) {
-    throw new Typecho_Plugin_Exception(_t('页面不存在'), 404);
+    throw new \Typecho\Plugin\Exception(_t('页面不存在'), 404);
 }
 
 list ($pluginName, $file) = explode('/', trim($panel, '/'), 2);
diff --git a/admin/file-upload-js.php b/admin/file-upload-js.php
index 88993322..af2432c1 100644
--- a/admin/file-upload-js.php
+++ b/admin/file-upload-js.php
@@ -1,8 +1,8 @@
 <?php if(!defined('__TYPECHO_ADMIN__')) exit; ?>
 <?php
-if (isset($post) && $post instanceof Typecho_Widget && $post->have()) {
+if (isset($post) && $post instanceof \Typecho\Widget && $post->have()) {
     $fileParentContent = $post;
-} else if (isset($page) && $page instanceof Typecho_Widget && $page->have()) {
+} else if (isset($page) && $page instanceof \Typecho\Widget && $page->have()) {
     $fileParentContent = $page;
 }
 
diff --git a/admin/file-upload.php b/admin/file-upload.php
index d2760945..be292021 100644
--- a/admin/file-upload.php
+++ b/admin/file-upload.php
@@ -5,9 +5,9 @@ if (isset($post) || isset($page)) {
     $cid = isset($post) ? $post->cid : $page->cid;
     
     if ($cid) {
-        Typecho_Widget::widget('Widget_Contents_Attachment_Related', 'parentId=' . $cid)->to($attachment);
+        \Typecho\Widget::widget('Widget_Contents_Attachment_Related', 'parentId=' . $cid)->to($attachment);
     } else {
-        Typecho_Widget::widget('Widget_Contents_Attachment_Unattached')->to($attachment);
+        \Typecho\Widget::widget('Widget_Contents_Attachment_Unattached')->to($attachment);
     }
 }
 ?>
diff --git a/admin/footer.php b/admin/footer.php
index 57c0084e..5909bc0a 100644
--- a/admin/footer.php
+++ b/admin/footer.php
@@ -3,4 +3,4 @@
 </html>
 <?php
 /** 注册一个结束插件 */
-Typecho_Plugin::factory('admin/footer.php')->end();
+\Typecho\Plugin::factory('admin/footer.php')->end();
diff --git a/admin/header.php b/admin/header.php
index e120e660..756eaec8 100644
--- a/admin/header.php
+++ b/admin/header.php
@@ -8,7 +8,7 @@ $header = '<link rel="stylesheet" href="' . $options->adminStaticUrl('css', 'nor
 <link rel="stylesheet" href="' . $options->adminStaticUrl('css', 'style.css', true) . '">';
 
 /** 注册一个初始化插件 */
-$header = Typecho_Plugin::factory('admin/header.php')->header($header);
+$header = \Typecho\Plugin::factory('admin/header.php')->header($header);
 
 ?><!DOCTYPE HTML>
 <html>
diff --git a/admin/index.php b/admin/index.php
index 9bb947c2..db698bdf 100644
--- a/admin/index.php
+++ b/admin/index.php
@@ -3,7 +3,7 @@ include 'common.php';
 include 'header.php';
 include 'menu.php';
 
-$stat = Typecho_Widget::widget('Widget_Stat');
+$stat = \Typecho\Widget::widget('Widget_Stat');
 ?>
 <div class="main">
     <div class="container typecho-dashboard">
@@ -48,7 +48,7 @@ $stat = Typecho_Widget::widget('Widget_Stat');
             <div class="col-mb-12 col-tb-4" role="complementary">
                 <section class="latest-link">
                     <h3><?php _e('最近发布的文章'); ?></h3>
-                    <?php Typecho_Widget::widget('Widget_Contents_Post_Recent', 'pageSize=10')->to($posts); ?>
+                    <?php \Typecho\Widget::widget('Widget_Contents_Post_Recent', 'pageSize=10')->to($posts); ?>
                     <ul>
                     <?php if($posts->have()): ?>
                     <?php while($posts->next()): ?>
@@ -68,7 +68,7 @@ $stat = Typecho_Widget::widget('Widget_Stat');
                 <section class="latest-link">
                     <h3><?php _e('最近得到的回复'); ?></h3>
                     <ul>
-                        <?php Typecho_Widget::widget('Widget_Comments_Recent', 'pageSize=10')->to($comments); ?>
+                        <?php \Typecho\Widget::widget('Widget_Comments_Recent', 'pageSize=10')->to($comments); ?>
                         <?php if($comments->have()): ?>
                         <?php while($comments->next()): ?>
                         <li>
diff --git a/admin/login.php b/admin/login.php
index 119f674e..353f7ab5 100644
--- a/admin/login.php
+++ b/admin/login.php
@@ -4,8 +4,8 @@ include 'common.php';
 if ($user->hasLogin()) {
     $response->redirect($options->adminUrl);
 }
-$rememberName = htmlspecialchars(Typecho_Cookie::get('__typecho_remember_name'));
-Typecho_Cookie::delete('__typecho_remember_name');
+$rememberName = htmlspecialchars(\Typecho\Cookie::get('__typecho_remember_name'));
+\Typecho\Cookie::delete('__typecho_remember_name');
 
 $bodyClass = 'body-100';
 
diff --git a/admin/manage-categories.php b/admin/manage-categories.php
index 8213db80..a388a179 100644
--- a/admin/manage-categories.php
+++ b/admin/manage-categories.php
@@ -3,7 +3,7 @@ include 'common.php';
 include 'header.php';
 include 'menu.php';
 
-Typecho_Widget::widget('Widget_Metas_Category_Admin')->to($categories);
+\Typecho\Widget::widget('Widget_Metas_Category_Admin')->to($categories);
 ?>
 
 <div class="main">
@@ -80,7 +80,7 @@ Typecho_Widget::widget('Widget_Metas_Category_Admin')->to($categories);
                                     <a class="hidden-by-mouse" href="<?php $security->index('/action/metas-category-edit?do=default&mid=' . $categories->mid); ?>" title="<?php _e('设为默认'); ?>"><?php _e('默认'); ?></a>
                                     <?php endif; ?>
                                     </td>
-                                    <td class="kit-hidden-mb"><a class="balloon-button left size-<?php echo Typecho_Common::splitByCount($categories->count, 1, 10, 20, 50, 100); ?>" href="<?php $options->adminUrl('manage-posts.php?category=' . $categories->mid); ?>"><?php $categories->count(); ?></a></td>
+                                    <td class="kit-hidden-mb"><a class="balloon-button left size-<?php echo \Typecho\Common::splitByCount($categories->count, 1, 10, 20, 50, 100); ?>" href="<?php $options->adminUrl('manage-posts.php?category=' . $categories->mid); ?>"><?php $categories->count(); ?></a></td>
                                 </tr>
                                 <?php endwhile; ?>
                                 <?php else: ?>
diff --git a/admin/manage-comments.php b/admin/manage-comments.php
index 602eab9d..65015084 100644
--- a/admin/manage-comments.php
+++ b/admin/manage-comments.php
@@ -3,9 +3,9 @@ include 'common.php';
 include 'header.php';
 include 'menu.php';
 
-$stat = Typecho_Widget::widget('Widget_Stat');
-$comments = Typecho_Widget::widget('Widget_Comments_Admin');
-$isAllComments = ('on' == $request->get('__typecho_all_comments') || 'on' == Typecho_Cookie::get('__typecho_all_comments'));
+$stat = \Typecho\Widget::widget('Widget_Stat');
+$comments = \Typecho\Widget::widget('Widget_Comments_Admin');
+$isAllComments = ('on' == $request->get('__typecho_all_comments') || 'on' == \Typecho\Cookie::get('__typecho_all_comments'));
 ?>
 <div class="main">
     <div class="body container">
diff --git a/admin/manage-medias.php b/admin/manage-medias.php
index dc66110c..d5f1df67 100644
--- a/admin/manage-medias.php
+++ b/admin/manage-medias.php
@@ -3,10 +3,10 @@ include 'common.php';
 include 'header.php';
 include 'menu.php';
 
-$stat = Typecho_Widget::widget('Widget_Stat');
+$stat = \Typecho\Widget::widget('Widget_Stat');
 ?>
 
-<?php Typecho_Widget::widget('Widget_Contents_Attachment_Admin')->to($attachments); ?>
+<?php \Typecho\Widget::widget('Widget_Contents_Attachment_Admin')->to($attachments); ?>
 <div class="main">
     <div class="body container">
         <?php include 'page-title.php'; ?>
@@ -59,10 +59,10 @@ $stat = Typecho_Widget::widget('Widget_Stat');
                         <tbody>
                         	<?php if($attachments->have()): ?>
                             <?php while($attachments->next()): ?>
-                            <?php $mime = Typecho_Common::mimeIconType($attachments->attachment->mime); ?>
+                            <?php $mime = \Typecho\Common::mimeIconType($attachments->attachment->mime); ?>
                             <tr id="<?php $attachments->theId(); ?>">
                                 <td class="kit-hidden-mb"><input type="checkbox" value="<?php $attachments->cid(); ?>" name="cid[]"/></td>
-                                <td class="kit-hidden-mb"><a href="<?php $options->adminUrl('manage-comments.php?cid=' . $attachments->cid); ?>" class="balloon-button size-<?php echo Typecho_Common::splitByCount($attachments->commentsNum, 1, 10, 20, 50, 100); ?>"><?php $attachments->commentsNum(); ?></a></td>
+                                <td class="kit-hidden-mb"><a href="<?php $options->adminUrl('manage-comments.php?cid=' . $attachments->cid); ?>" class="balloon-button size-<?php echo \Typecho\Common::splitByCount($attachments->commentsNum, 1, 10, 20, 50, 100); ?>"><?php $attachments->commentsNum(); ?></a></td>
                                 <td>
                                 <i class="mime-<?php echo $mime; ?>"></i>
                                 <a href="<?php $options->adminUrl('media.php?cid=' . $attachments->cid); ?>"><?php $attachments->title(); ?></a>
diff --git a/admin/manage-pages.php b/admin/manage-pages.php
index a3b443a6..51e2cc60 100644
--- a/admin/manage-pages.php
+++ b/admin/manage-pages.php
@@ -3,7 +3,7 @@ include 'common.php';
 include 'header.php';
 include 'menu.php';
 
-$stat = Typecho_Widget::widget('Widget_Stat');
+$stat = \Typecho\Widget::widget('Widget_Stat');
 ?>
 <div class="main">
     <div class="body container">
@@ -56,12 +56,12 @@ $stat = Typecho_Widget::widget('Widget_Stat');
                             </tr>
                         </thead>
                         <tbody>
-                        	<?php Typecho_Widget::widget('Widget_Contents_Page_Admin')->to($pages); ?>
+                        	<?php \Typecho\Widget::widget('Widget_Contents_Page_Admin')->to($pages); ?>
                         	<?php if($pages->have()): ?>
                             <?php while($pages->next()): ?>
                             <tr id="<?php $pages->theId(); ?>">
                                 <td class="kit-hidden-mb"><input type="checkbox" value="<?php $pages->cid(); ?>" name="cid[]"/></td>
-                                <td class="kit-hidden-mb"><a href="<?php $options->adminUrl('manage-comments.php?cid=' . $pages->cid); ?>" class="balloon-button size-<?php echo Typecho_Common::splitByCount($pages->commentsNum, 1, 10, 20, 50, 100); ?>" title="<?php $pages->commentsNum(); ?> <?php _e('评论'); ?>"><?php $pages->commentsNum(); ?></a></td>
+                                <td class="kit-hidden-mb"><a href="<?php $options->adminUrl('manage-comments.php?cid=' . $pages->cid); ?>" class="balloon-button size-<?php echo \Typecho\Common::splitByCount($pages->commentsNum, 1, 10, 20, 50, 100); ?>" title="<?php $pages->commentsNum(); ?> <?php _e('评论'); ?>"><?php $pages->commentsNum(); ?></a></td>
                                 <td>
                                 <a href="<?php $options->adminUrl('write-page.php?cid=' . $pages->cid); ?>"><?php $pages->title(); ?></a>
                                 <?php 
@@ -83,7 +83,7 @@ $stat = Typecho_Widget::widget('Widget_Stat');
                                 <td>
                                 <?php if ($pages->hasSaved): ?>
                                 <span class="description">
-                                <?php $modifyDate = new Typecho_Date($pages->modified); ?>
+                                <?php $modifyDate = new \Typecho\Date($pages->modified); ?>
                                 <?php _e('保存于 %s', $modifyDate->word()); ?>
                                 </span>
                                 <?php else: ?>
diff --git a/admin/manage-posts.php b/admin/manage-posts.php
index 0b3fe284..ec35d439 100644
--- a/admin/manage-posts.php
+++ b/admin/manage-posts.php
@@ -3,9 +3,9 @@ include 'common.php';
 include 'header.php';
 include 'menu.php';
 
-$stat = Typecho_Widget::widget('Widget_Stat');
-$posts = Typecho_Widget::widget('Widget_Contents_Post_Admin');
-$isAllPosts = ('on' == $request->get('__typecho_all_posts') || 'on' == Typecho_Cookie::get('__typecho_all_posts'));
+$stat = \Typecho\Widget::widget('Widget_Stat');
+$posts = \Typecho\Widget::widget('Widget_Contents_Post_Admin');
+$isAllPosts = ('on' == $request->get('__typecho_all_posts') || 'on' == \Typecho\Cookie::get('__typecho_all_posts'));
 ?>
 <div class="main">
     <div class="body container">
@@ -72,7 +72,7 @@ $isAllPosts = ('on' == $request->get('__typecho_all_posts') || 'on' == Typecho_C
                             <input type="text" class="text-s" placeholder="<?php _e('请输入关键字'); ?>" value="<?php echo htmlspecialchars($request->keywords); ?>" name="keywords" />
                             <select name="category">
                             	<option value=""><?php _e('所有分类'); ?></option>
-                            	<?php Typecho_Widget::widget('Widget_Metas_Category_List')->to($category); ?>
+                            	<?php \Typecho\Widget::widget('Widget_Metas_Category_List')->to($category); ?>
                             	<?php while($category->next()): ?>
                             	<option value="<?php $category->mid(); ?>"<?php if($request->get('category') == $category->mid): ?> selected="true"<?php endif; ?>><?php $category->name(); ?></option>
                             	<?php endwhile; ?>
@@ -114,7 +114,7 @@ $isAllPosts = ('on' == $request->get('__typecho_all_posts') || 'on' == Typecho_C
                             <?php while($posts->next()): ?>
                             <tr id="<?php $posts->theId(); ?>">
                                 <td class="kit-hidden-mb"><input type="checkbox" value="<?php $posts->cid(); ?>" name="cid[]"/></td>
-                                <td class="kit-hidden-mb"><a href="<?php $options->adminUrl('manage-comments.php?cid=' . ($posts->parentId ? $posts->parentId : $posts->cid)); ?>" class="balloon-button size-<?php echo Typecho_Common::splitByCount($posts->commentsNum, 1, 10, 20, 50, 100); ?>" title="<?php $posts->commentsNum(); ?> <?php _e('评论'); ?>"><?php $posts->commentsNum(); ?></a></td>
+                                <td class="kit-hidden-mb"><a href="<?php $options->adminUrl('manage-comments.php?cid=' . ($posts->parentId ? $posts->parentId : $posts->cid)); ?>" class="balloon-button size-<?php echo \Typecho\Common::splitByCount($posts->commentsNum, 1, 10, 20, 50, 100); ?>" title="<?php $posts->commentsNum(); ?> <?php _e('评论'); ?>"><?php $posts->commentsNum(); ?></a></td>
                                 <td>
                                 <a href="<?php $options->adminUrl('write-post.php?cid=' . $posts->cid); ?>"><?php $posts->title(); ?></a>
                                 <?php 
@@ -150,7 +150,7 @@ $isAllPosts = ('on' == $request->get('__typecho_all_posts') || 'on' == Typecho_C
                                 <td>
                                 <?php if ($posts->hasSaved): ?>
                                 <span class="description">
-                                <?php $modifyDate = new Typecho_Date($posts->modified); ?>
+                                <?php $modifyDate = new \Typecho\Date($posts->modified); ?>
                                 <?php _e('保存于 %s', $modifyDate->word()); ?>
                                 </span>
                                 <?php else: ?>
diff --git a/admin/manage-tags.php b/admin/manage-tags.php
index b0f6ffd8..3ed08c7a 100644
--- a/admin/manage-tags.php
+++ b/admin/manage-tags.php
@@ -3,7 +3,7 @@ include 'common.php';
 include 'header.php';
 include 'menu.php';
 
-Typecho_Widget::widget('Widget_Metas_Tag_Admin')->to($tags);
+\Typecho\Widget::widget('Widget_Metas_Tag_Admin')->to($tags);
 ?>
 
 <div class="main">
@@ -49,7 +49,7 @@ Typecho_Widget::widget('Widget_Metas_Tag_Admin')->to($tags);
                     
                 </div>
                 <div class="col-mb-12 col-tb-4" role="form">
-                    <?php Typecho_Widget::widget('Widget_Metas_Tag_Edit')->form()->render(); ?>
+                    <?php \Typecho\Widget::widget('Widget_Metas_Tag_Edit')->form()->render(); ?>
                 </div>
         </div>
     </div>
diff --git a/admin/manage-users.php b/admin/manage-users.php
index c61cea7d..f4f291b8 100644
--- a/admin/manage-users.php
+++ b/admin/manage-users.php
@@ -51,11 +51,11 @@ include 'menu.php';
                             </tr>
                         </thead>
                         <tbody>
-                        	<?php Typecho_Widget::widget('Widget_Users_Admin')->to($users); ?>
+                        	<?php \Typecho\Widget::widget('Widget_Users_Admin')->to($users); ?>
                             <?php while($users->next()): ?>
                             <tr id="user-<?php $users->uid(); ?>">
                                 <td class="kit-hidden-mb"><input type="checkbox" value="<?php $users->uid(); ?>" name="uid[]"/></td>
-                                <td class="kit-hidden-mb"><a href="<?php $options->adminUrl('manage-posts.php?uid=' . $users->uid); ?>" class="balloon-button left size-<?php echo Typecho_Common::splitByCount($users->postsNum, 1, 10, 20, 50, 100); ?>"><?php $users->postsNum(); ?></a></td>
+                                <td class="kit-hidden-mb"><a href="<?php $options->adminUrl('manage-posts.php?uid=' . $users->uid); ?>" class="balloon-button left size-<?php echo \Typecho\Common::splitByCount($users->postsNum, 1, 10, 20, 50, 100); ?>"><?php $users->postsNum(); ?></a></td>
                                 <td><a href="<?php $options->adminUrl('user.php?uid=' . $users->uid); ?>"><?php $users->name(); ?></a>
                                 <a href="<?php $users->permalink(); ?>" title="<?php _e('浏览 %s', $users->screenName); ?>"><i class="i-exlink"></i></a>
                                 </td>
diff --git a/admin/media.php b/admin/media.php
index db4266fa..2047da26 100644
--- a/admin/media.php
+++ b/admin/media.php
@@ -9,7 +9,7 @@ if (preg_match("/^([0-9]+)([a-z]{1,2})$/i", $phpMaxFilesize, $matches)) {
     $phpMaxFilesize = strtolower($matches[1] . $matches[2] . (1 == strlen($matches[2]) ? 'b' : ''));
 }
 
-Typecho_Widget::widget('Widget_Contents_Attachment_Edit')->to($attachment);
+\Typecho\Widget::widget('Widget_Contents_Attachment_Edit')->to($attachment);
 ?>
 
 <div class="main">
@@ -22,7 +22,7 @@ Typecho_Widget::widget('Widget_Contents_Attachment_Edit')->to($attachment);
                 <?php endif; ?>
                 
                 <p>
-                    <?php $mime = Typecho_Common::mimeIconType($attachment->attachment->mime); ?>
+                    <?php $mime = \Typecho\Common::mimeIconType($attachment->attachment->mime); ?>
                     <i class="mime-<?php echo $mime; ?>"></i>
                     <a href=""><strong><?php $attachment->attachment->name(); ?></strong></a>
                     <span><?php echo number_format(ceil($attachment->attachment->size / 1024)); ?> Kb</span>
diff --git a/admin/menu.php b/admin/menu.php
index 357e8d25..e1b76e70 100644
--- a/admin/menu.php
+++ b/admin/menu.php
@@ -5,9 +5,9 @@
         <?php $menu->output(); ?>
     </nav>
     <div class="operate">
-        <?php Typecho_Plugin::factory('admin/menu.php')->navBar(); ?><a title="<?php
+        <?php \Typecho\Plugin::factory('admin/menu.php')->navBar(); ?><a title="<?php
                     if ($user->logged > 0) {
-                        $logged = new Typecho_Date($user->logged);
+                        $logged = new \Typecho\Date($user->logged);
                         _e('最后登录: %s', $logged->word());
                     }
                     ?>" href="<?php $options->adminUrl('profile.php'); ?>" class="author"><?php $user->screenName(); ?></a><a class="exit" href="<?php $options->logoutUrl(); ?>"><?php _e('登出'); ?></a><a href="<?php $options->siteUrl(); ?>"><?php _e('网站'); ?></a>
diff --git a/admin/options-discussion.php b/admin/options-discussion.php
index 5468985b..a4ccd2f9 100644
--- a/admin/options-discussion.php
+++ b/admin/options-discussion.php
@@ -9,7 +9,7 @@ include 'menu.php';
         <?php include 'page-title.php'; ?>
         <div class="row typecho-page-main" role="form">
             <div class="col-mb-12 col-tb-8 col-tb-offset-2">
-                <?php Typecho_Widget::widget('Widget_Options_Discussion')->form()->render(); ?>
+                <?php \Typecho\Widget::widget('Widget_Options_Discussion')->form()->render(); ?>
             </div>
         </div>
     </div>
diff --git a/admin/options-general.php b/admin/options-general.php
index 062018a2..da089e62 100644
--- a/admin/options-general.php
+++ b/admin/options-general.php
@@ -9,7 +9,7 @@ include 'menu.php';
         <?php include 'page-title.php'; ?>
         <div class="row typecho-page-main" role="form">
             <div class="col-mb-12 col-tb-8 col-tb-offset-2">
-                <?php Typecho_Widget::widget('Widget_Options_General')->form()->render(); ?>
+                <?php \Typecho\Widget::widget('Widget_Options_General')->form()->render(); ?>
             </div>
         </div>
     </div>
diff --git a/admin/options-permalink.php b/admin/options-permalink.php
index b715d6d5..8f195dbb 100644
--- a/admin/options-permalink.php
+++ b/admin/options-permalink.php
@@ -9,7 +9,7 @@ include 'menu.php';
         <?php include 'page-title.php'; ?>
         <div class="row typecho-page-main" role="form">
             <div class="col-mb-12 col-tb-8 col-tb-offset-2">
-                <?php Typecho_Widget::widget('Widget_Options_Permalink')->form()->render(); ?>
+                <?php \Typecho\Widget::widget('Widget_Options_Permalink')->form()->render(); ?>
             </div>
         </div>
     </div>
diff --git a/admin/options-plugin.php b/admin/options-plugin.php
index f74c2493..724a6b2e 100644
--- a/admin/options-plugin.php
+++ b/admin/options-plugin.php
@@ -9,7 +9,7 @@ include 'menu.php';
         <?php include 'page-title.php'; ?>
         <div class="row typecho-page-main" role="form">
             <div class="col-mb-12 col-tb-8 col-tb-offset-2">
-                <?php Typecho_Widget::widget('Widget_Plugins_Config')->config()->render(); ?>
+                <?php \Typecho\Widget::widget('Widget_Plugins_Config')->config()->render(); ?>
             </div>
         </div>
     </div>
diff --git a/admin/options-reading.php b/admin/options-reading.php
index 6c871bd2..d3cdaefd 100644
--- a/admin/options-reading.php
+++ b/admin/options-reading.php
@@ -9,7 +9,7 @@ include 'menu.php';
         <?php include 'page-title.php'; ?>
         <div class="row typecho-page-main" role="form">
             <div class="col-mb-12 col-tb-8 col-tb-offset-2">
-                <?php Typecho_Widget::widget('Widget_Options_Reading')->form()->render(); ?>
+                <?php \Typecho\Widget::widget('Widget_Options_Reading')->form()->render(); ?>
             </div>
         </div>
     </div>
diff --git a/admin/options-theme.php b/admin/options-theme.php
index d5fdb46e..38b091ed 100644
--- a/admin/options-theme.php
+++ b/admin/options-theme.php
@@ -18,7 +18,7 @@ include 'menu.php';
                 </ul>
             </div>
             <div class="col-mb-12 col-tb-8 col-tb-offset-2" role="form">
-                <?php Typecho_Widget::widget('Widget_Themes_Config')->config()->render(); ?>
+                <?php \Typecho\Widget::widget('Widget_Themes_Config')->config()->render(); ?>
             </div>
         </div>
     </div>
diff --git a/admin/plugins.php b/admin/plugins.php
index b6ca0e7f..67e883f7 100644
--- a/admin/plugins.php
+++ b/admin/plugins.php
@@ -8,7 +8,7 @@ include 'menu.php';
         <?php include 'page-title.php'; ?>
         <div class="row typecho-page-main" role="main">
             <div class="col-mb-12 typecho-list">
-                <?php Typecho_Widget::widget('Widget_Plugins_List@activated', 'activated=1')->to($activatedPlugins); ?>
+                <?php \Typecho\Widget::widget('Widget_Plugins_List@activated', 'activated=1')->to($activatedPlugins); ?>
                 <?php if ($activatedPlugins->have() || !empty($activatedPlugins->activatedPlugins)): ?>
                 <h4 class="typecho-list-table-title"><?php _e('启用的插件'); ?></h4>
                 <div class="typecho-table-wrap">
@@ -70,7 +70,7 @@ include 'menu.php';
                 </div>
                 <?php endif; ?>
                 
-                <?php Typecho_Widget::widget('Widget_Plugins_List@unactivated', 'activated=0')->to($deactivatedPlugins); ?>
+                <?php \Typecho\Widget::widget('Widget_Plugins_List@unactivated', 'activated=0')->to($deactivatedPlugins); ?>
                 <?php if ($deactivatedPlugins->have() || !$activatedPlugins->have()): ?>
                 <h4 class="typecho-list-table-title"><?php _e('禁用的插件'); ?></h4>
                 <div class="typecho-table-wrap">
diff --git a/admin/preview.php b/admin/preview.php
index 8ce0ca47..5ed1a5e7 100644
--- a/admin/preview.php
+++ b/admin/preview.php
@@ -3,7 +3,7 @@
 include 'common.php';
 
 /** 获取内容 Widget */
-Typecho_Widget::widget('Widget_Archive', 'type=single&checkPermalink=0&preview=1')->to($content);
+\Typecho\Widget::widget('Widget_Archive', 'type=single&checkPermalink=0&preview=1')->to($content);
 
 /** 检测是否存在 */
 if (!$content->have()) {
diff --git a/admin/profile.php b/admin/profile.php
index 589e4134..48cde455 100644
--- a/admin/profile.php
+++ b/admin/profile.php
@@ -3,7 +3,7 @@ include 'common.php';
 include 'header.php';
 include 'menu.php';
 
-$stat = Typecho_Widget::widget('Widget_Stat');
+$stat = \Typecho\Widget::widget('Widget_Stat');
 ?>
 
 <div class="main">
@@ -11,14 +11,14 @@ $stat = Typecho_Widget::widget('Widget_Stat');
         <?php include 'page-title.php'; ?>
         <div class="row typecho-page-main">
             <div class="col-mb-12 col-tb-3">
-                <p><a href="http://gravatar.com/emails/" title="<?php _e('在 Gravatar 上修改头像'); ?>"><?php echo '<img class="profile-avatar" src="' . Typecho_Common::gravatarUrl($user->mail, 220, 'X', 'mm', $request->isSecure()) . '" alt="' . $user->screenName . '" />'; ?></a></p>
+                <p><a href="http://gravatar.com/emails/" title="<?php _e('在 Gravatar 上修改头像'); ?>"><?php echo '<img class="profile-avatar" src="' . \Typecho\Common::gravatarUrl($user->mail, 220, 'X', 'mm', $request->isSecure()) . '" alt="' . $user->screenName . '" />'; ?></a></p>
                 <h2><?php $user->screenName(); ?></h2>
                 <p><?php $user->name(); ?></p>
                 <p><?php _e('目前有 <em>%s</em> 篇日志, 并有 <em>%s</em> 条关于你的评论在 <em>%s</em> 个分类中.', 
                 $stat->myPublishedPostsNum, $stat->myPublishedCommentsNum, $stat->categoriesNum); ?></p>
                 <p><?php
                 if ($user->logged > 0) {
-                    $logged = new Typecho_Date($user->logged);
+                    $logged = new \Typecho\Date($user->logged);
                     _e('最后登录: %s', $logged->word());
                 }
                 ?></p>
@@ -27,14 +27,14 @@ $stat = Typecho_Widget::widget('Widget_Stat');
             <div class="col-mb-12 col-tb-6 col-tb-offset-1 typecho-content-panel" role="form">
                 <section>
                     <h3><?php _e('个人资料'); ?></h3>
-                    <?php Typecho_Widget::widget('Widget_Users_Profile')->profileForm()->render(); ?>
+                    <?php \Typecho\Widget::widget('Widget_Users_Profile')->profileForm()->render(); ?>
                 </section>
 
                 <?php if($user->pass('contributor', true)): ?>
                 <br>
                 <section id="writing-option">
                     <h3><?php _e('撰写设置'); ?></h3>
-                    <?php Typecho_Widget::widget('Widget_Users_Profile')->optionsForm()->render(); ?>
+                    <?php \Typecho\Widget::widget('Widget_Users_Profile')->optionsForm()->render(); ?>
                 </section>
                 <?php endif; ?>
 
@@ -42,10 +42,10 @@ $stat = Typecho_Widget::widget('Widget_Stat');
 
                 <section id="change-password">
                     <h3><?php _e('密码修改'); ?></h3>
-                    <?php Typecho_Widget::widget('Widget_Users_Profile')->passwordForm()->render(); ?>
+                    <?php \Typecho\Widget::widget('Widget_Users_Profile')->passwordForm()->render(); ?>
                 </section>
 
-                <?php Typecho_Widget::widget('Widget_Users_Profile')->personalFormList(); ?>
+                <?php \Typecho\Widget::widget('Widget_Users_Profile')->personalFormList(); ?>
             </div>
         </div>
     </div>
@@ -55,6 +55,6 @@ $stat = Typecho_Widget::widget('Widget_Stat');
 include 'copyright.php';
 include 'common-js.php';
 include 'form-js.php';
-Typecho_Plugin::factory('admin/profile.php')->bottom();
+\Typecho\Plugin::factory('admin/profile.php')->bottom();
 include 'footer.php';
 ?>
diff --git a/admin/register.php b/admin/register.php
index 5c8a11c6..72e662ef 100644
--- a/admin/register.php
+++ b/admin/register.php
@@ -4,10 +4,10 @@ include 'common.php';
 if ($user->hasLogin() || !$options->allowRegister) {
     $response->redirect($options->siteUrl);
 }
-$rememberName = htmlspecialchars(Typecho_Cookie::get('__typecho_remember_name'));
-$rememberMail = htmlspecialchars(Typecho_Cookie::get('__typecho_remember_mail'));
-Typecho_Cookie::delete('__typecho_remember_name');
-Typecho_Cookie::delete('__typecho_remember_mail');
+$rememberName = htmlspecialchars(\Typecho\Cookie::get('__typecho_remember_name'));
+$rememberMail = htmlspecialchars(\Typecho\Cookie::get('__typecho_remember_mail'));
+\Typecho\Cookie::delete('__typecho_remember_name');
+\Typecho\Cookie::delete('__typecho_remember_mail');
 
 $bodyClass = 'body-100';
 
diff --git a/admin/theme-editor.php b/admin/theme-editor.php
index e8b8208f..0f9812ea 100644
--- a/admin/theme-editor.php
+++ b/admin/theme-editor.php
@@ -3,7 +3,7 @@ include 'common.php';
 include 'header.php';
 include 'menu.php';
 
-Typecho_Widget::widget('Widget_Themes_Files')->to($files);
+\Typecho\Widget::widget('Widget_Themes_Files')->to($files);
 ?>
 
 <div class="main">
@@ -57,6 +57,6 @@ Typecho_Widget::widget('Widget_Themes_Files')->to($files);
 <?php
 include 'copyright.php';
 include 'common-js.php';
-Typecho_Plugin::factory('admin/theme-editor.php')->bottom($files);
+\Typecho\Plugin::factory('admin/theme-editor.php')->bottom($files);
 include 'footer.php';
 ?>
diff --git a/admin/themes.php b/admin/themes.php
index 55387114..ce570cd4 100644
--- a/admin/themes.php
+++ b/admin/themes.php
@@ -32,7 +32,7 @@ include 'menu.php';
                         </thead>
 
                         <tbody>
-                            <?php Typecho_Widget::widget('Widget_Themes_List')->to($themes); ?>
+                            <?php \Typecho\Widget::widget('Widget_Themes_List')->to($themes); ?>
                             <?php while($themes->next()): ?>
                             <tr id="theme-<?php $themes->name(); ?>" class="<?php if($themes->activated): ?>current<?php endif; ?>">
                                 <td valign="top"><img src="<?php $themes->screen(); ?>" alt="<?php $themes->name(); ?>" /></td>
diff --git a/admin/upgrade.php b/admin/upgrade.php
index 281ace2b..2b11c6be 100644
--- a/admin/upgrade.php
+++ b/admin/upgrade.php
@@ -13,7 +13,7 @@ $errors = $security->systemCheck();
             <div class="col-mb-12">
                 <div id="typecho-welcome">
                     <?php if (!empty($errors)): ?>
-                        <form action="<?php echo Typecho_Common::url('upgrade.php', $options->adminUrl); ?>" method="get">
+                        <form action="<?php echo \Typecho\Common::url('upgrade.php', $options->adminUrl); ?>" method="get">
                             <h3><?php _e('发现安全问题'); ?></h3>
                             <ul>
                                 <?php foreach ($errors as $error): ?>
@@ -24,13 +24,13 @@ $errors = $security->systemCheck();
                         </form>
                     <?php else: ?>
                         <form action="<?php echo $security->getTokenUrl(
-                            Typecho_Router::url('do', array('action' => 'upgrade', 'widget' => 'Upgrade'),
-                                Typecho_Common::url('index.php', $options->rootUrl))); ?>" method="post">
+                            \Typecho\Router::url('do', array('action' => 'upgrade', 'widget' => 'Upgrade'),
+                                \Typecho\Common::url('index.php', $options->rootUrl))); ?>" method="post">
                             <h3><?php _e('检测到新版本!'); ?></h3>
                             <ul>
                                 <li><?php _e('您已经更新了系统程序, 我们还需要执行一些后续步骤来完成升级'); ?></li>
-                                <li><?php _e('此程序将把您的系统从 <strong>%s</strong> 升级到 <strong>%s</strong>', $options->version, Typecho_Common::VERSION); ?></li>
-                                <li><strong class="warning"><?php _e('在升级之前强烈建议先<a href="%s">备份您的数据</a>', Typecho_Common::url('backup.php', $options->adminUrl)); ?></strong></li>
+                                <li><?php _e('此程序将把您的系统从 <strong>%s</strong> 升级到 <strong>%s</strong>', $options->version, \Typecho\Common::VERSION); ?></li>
+                                <li><strong class="warning"><?php _e('在升级之前强烈建议先<a href="%s">备份您的数据</a>', \Typecho\Common::url('backup.php', $options->adminUrl)); ?></strong></li>
                             </ul>
                             <p><button class="btn primary" type="submit"><?php _e('完成升级 &raquo;'); ?></button></p>
                         </form>
diff --git a/admin/user.php b/admin/user.php
index f6cb957e..a8c33c06 100644
--- a/admin/user.php
+++ b/admin/user.php
@@ -9,7 +9,7 @@ include 'menu.php';
         <?php include 'page-title.php'; ?>
         <div class="row typecho-page-main" role="form">
             <div class="col-mb-12 col-tb-6 col-tb-offset-3">
-                <?php Typecho_Widget::widget('Widget_Users_Edit')->form()->render(); ?>
+                <?php \Typecho\Widget::widget('Widget_Users_Edit')->form()->render(); ?>
             </div>
         </div>
     </div>
diff --git a/admin/write-js.php b/admin/write-js.php
index ac339ad0..adee5dc8 100644
--- a/admin/write-js.php
+++ b/admin/write-js.php
@@ -1,6 +1,6 @@
 <?php if(!defined('__TYPECHO_ADMIN__')) exit; ?>
-<?php Typecho_Plugin::factory('admin/write-js.php')->write(); ?>
-<?php Typecho_Widget::widget('Widget_Metas_Tag_Cloud', 'sort=count&desc=1&limit=200')->to($tags); ?>
+<?php \Typecho\Plugin::factory('admin/write-js.php')->write(); ?>
+<?php \Typecho\Widget::widget('Widget_Metas_Tag_Cloud', 'sort=count&desc=1&limit=200')->to($tags); ?>
 
 <script src="<?php $options->adminStaticUrl('js', 'timepicker.js'); ?>"></script>
 <script src="<?php $options->adminStaticUrl('js', 'tokeninput.js'); ?>"></script>
diff --git a/admin/write-page.php b/admin/write-page.php
index 3c47b721..5a591284 100644
--- a/admin/write-page.php
+++ b/admin/write-page.php
@@ -2,7 +2,7 @@
 include 'common.php';
 include 'header.php';
 include 'menu.php';
-Typecho_Widget::widget('Widget_Contents_Page_Edit')->to($page);
+\Typecho\Widget::widget('Widget_Contents_Page_Edit')->to($page);
 ?>
 <div class="main">
     <div class="body container">
@@ -12,7 +12,7 @@ Typecho_Widget::widget('Widget_Contents_Page_Edit')->to($page);
                 <div class="col-mb-12 col-tb-9" role="main">
                     <?php if ($page->draft): ?>
                         <?php if ($page->draft['cid'] != $page->cid): ?>
-                            <?php $pageModifyDate = new Typecho_Date($page->draft['modified']); ?>
+                            <?php $pageModifyDate = new \Typecho\Date($page->draft['modified']); ?>
                             <cite class="edit-draft-notice"><?php _e('当前正在编辑的是保存于%s的草稿, 你可以<a href="%s">删除它</a>', $pageModifyDate->word(),
                                     $security->getIndex('/action/contents-page-edit?do=deleteDraft&cid=' . $page->cid)); ?></cite>
                         <?php else: ?>
@@ -25,7 +25,7 @@ Typecho_Widget::widget('Widget_Contents_Page_Edit')->to($page);
                         <label for="title" class="sr-only"><?php _e('标题'); ?></label>
                         <input type="text" id="title" name="title" autocomplete="off" value="<?php $page->title(); ?>" placeholder="<?php _e('标题'); ?>" class="w-100 text title" />
                     </p>
-                    <?php $permalink = Typecho_Common::url($options->routingTable['page']['url'], $options->index);
+                    <?php $permalink = \Typecho\Common::url($options->routingTable['page']['url'], $options->index);
                     list ($scheme, $permalink) = explode(':', $permalink, 2);
                     $permalink = ltrim($permalink, '/');
                     $permalink = preg_replace("/\[([_a-z0-9-]+)[^\]]*\]/i", "{\\1}", $permalink);
@@ -59,7 +59,7 @@ Typecho_Widget::widget('Widget_Contents_Page_Edit')->to($page);
                         </span>
                     </p>
                     
-                    <?php Typecho_Plugin::factory('admin/write-page.php')->content($page); ?>
+                    <?php \Typecho\Plugin::factory('admin/write-page.php')->content($page); ?>
                 </div>
                 <div id="edit-secondary" class="col-mb-12 col-tb-3" role="complementary">
                     <ul class="typecho-option-tabs clearfix">
@@ -92,7 +92,7 @@ Typecho_Widget::widget('Widget_Contents_Page_Edit')->to($page);
                                 <p class="description"><?php _e('如果你为此页面选择了一个自定义模板, 系统将按照你选择的模板文件展现它'); ?></p>
                         </section>
 
-                        <?php Typecho_Plugin::factory('admin/write-page.php')->option($page); ?>
+                        <?php \Typecho\Plugin::factory('admin/write-page.php')->option($page); ?>
 
                         <button type="button" id="advance-panel-btn" class="btn btn-xs"><?php _e('高级选项'); ?> <i class="i-caret-down"></i></button>
                         <div id="advance-panel">
@@ -118,15 +118,15 @@ Typecho_Widget::widget('Widget_Contents_Page_Edit')->to($page);
                                 </ul>
                             </section>
                             
-                            <?php Typecho_Plugin::factory('admin/write-page.php')->advanceOption($page); ?>
+                            <?php \Typecho\Plugin::factory('admin/write-page.php')->advanceOption($page); ?>
                         </div>
                         <?php if($page->have()): ?>
-                        <?php $modified = new Typecho_Date($page->modified); ?>
+                        <?php $modified = new \Typecho\Date($page->modified); ?>
                         <section class="typecho-post-option">
                         <p class="description">
                             <br>&mdash;<br>
                             <?php _e('本页面由 <a href="%s">%s</a> 创建',
-                            Typecho_Common::url('manage-pages.php?uid=' . $page->author->uid, $options->adminUrl), $page->author->screenName); ?><br>
+                            \Typecho\Common::url('manage-pages.php?uid=' . $page->author->uid, $options->adminUrl), $page->author->screenName); ?><br>
                             <?php _e('最后更新于 %s', $modified->word()); ?>
                         </p>
                         </section>
@@ -148,13 +148,13 @@ include 'common-js.php';
 include 'form-js.php';
 include 'write-js.php';
 
-Typecho_Plugin::factory('admin/write-page.php')->trigger($plugged)->richEditor($page);
+\Typecho\Plugin::factory('admin/write-page.php')->trigger($plugged)->richEditor($page);
 if (!$plugged) {
     include 'editor-js.php';
 }
 
 include 'file-upload-js.php';
 include 'custom-fields-js.php';
-Typecho_Plugin::factory('admin/write-page.php')->bottom($page);
+\Typecho\Plugin::factory('admin/write-page.php')->bottom($page);
 include 'footer.php';
 ?>
diff --git a/admin/write-post.php b/admin/write-post.php
index 306ef1a7..ea9e57ef 100644
--- a/admin/write-post.php
+++ b/admin/write-post.php
@@ -2,7 +2,7 @@
 include 'common.php';
 include 'header.php';
 include 'menu.php';
-Typecho_Widget::widget('Widget_Contents_Post_Edit')->to($post);
+\Typecho\Widget::widget('Widget_Contents_Post_Edit')->to($post);
 ?>
 <div class="main">
     <div class="body container">
@@ -12,7 +12,7 @@ Typecho_Widget::widget('Widget_Contents_Post_Edit')->to($post);
                 <div class="col-mb-12 col-tb-9" role="main">
                     <?php if ($post->draft): ?>
                         <?php if ($post->draft['cid'] != $post->cid): ?>
-                            <?php $postModifyDate = new Typecho_Date($post->draft['modified']); ?>
+                            <?php $postModifyDate = new \Typecho\Date($post->draft['modified']); ?>
                             <cite class="edit-draft-notice"><?php _e('你正在编辑的是保存于 %s 的草稿, 你也可以 <a href="%s">删除它</a>', $postModifyDate->word(),
                                     $security->getIndex('/action/contents-post-edit?do=deleteDraft&cid=' . $post->cid)); ?></cite>
                         <?php else: ?>
@@ -25,7 +25,7 @@ Typecho_Widget::widget('Widget_Contents_Post_Edit')->to($post);
                         <label for="title" class="sr-only"><?php _e('标题'); ?></label>
                         <input type="text" id="title" name="title" autocomplete="off" value="<?php $post->title(); ?>" placeholder="<?php _e('标题'); ?>" class="w-100 text title" />
                     </p>
-                    <?php $permalink = Typecho_Common::url($options->routingTable['post']['url'], $options->index);
+                    <?php $permalink = \Typecho\Common::url($options->routingTable['post']['url'], $options->index);
                     list ($scheme, $permalink) = explode(':', $permalink, 2);
                     $permalink = ltrim($permalink, '/');
                     $permalink = preg_replace("/\[([_a-z0-9-]+)[^\]]*\]/i", "{\\1}", $permalink);
@@ -64,7 +64,7 @@ Typecho_Widget::widget('Widget_Contents_Post_Edit')->to($post);
                         </span>
                     </p>
 
-                    <?php Typecho_Plugin::factory('admin/write-post.php')->content($post); ?>
+                    <?php \Typecho\Plugin::factory('admin/write-post.php')->content($post); ?>
                 </div>
 
                 <div id="edit-secondary" class="col-mb-12 col-tb-3" role="complementary">
@@ -82,7 +82,7 @@ Typecho_Widget::widget('Widget_Contents_Post_Edit')->to($post);
 
                         <section class="typecho-post-option category-option">
                             <label class="typecho-label"><?php _e('分类'); ?></label>
-                            <?php Typecho_Widget::widget('Widget_Metas_Category_List')->to($category); ?>
+                            <?php \Typecho\Widget::widget('Widget_Metas_Category_List')->to($category); ?>
                             <ul>
                                 <?php
                                 if ($post->have()) {
@@ -103,7 +103,7 @@ Typecho_Widget::widget('Widget_Contents_Post_Edit')->to($post);
                             <p><input id="tags" name="tags" type="text" value="<?php $post->tags(',', false); ?>" class="w-100 text" /></p>
                         </section>
 
-                        <?php Typecho_Plugin::factory('admin/write-post.php')->option($post); ?>
+                        <?php \Typecho\Plugin::factory('admin/write-post.php')->option($post); ?>
 
                         <button type="button" id="advance-panel-btn" class="btn btn-xs"><?php _e('高级选项'); ?> <i class="i-caret-down"></i></button>
                         <div id="advance-panel">
@@ -146,16 +146,16 @@ Typecho_Widget::widget('Widget_Contents_Post_Edit')->to($post);
                                 <p class="description"><?php _e('每一行一个引用地址, 用回车隔开'); ?></p>
                             </section>
 
-                            <?php Typecho_Plugin::factory('admin/write-post.php')->advanceOption($post); ?>
+                            <?php \Typecho\Plugin::factory('admin/write-post.php')->advanceOption($post); ?>
                         </div><!-- end #advance-panel -->
 
                         <?php if($post->have()): ?>
-                        <?php $modified = new Typecho_Date($post->modified); ?>
+                        <?php $modified = new \Typecho\Date($post->modified); ?>
                         <section class="typecho-post-option">
                             <p class="description">
                                 <br>&mdash;<br>
                                 <?php _e('本文由 <a href="%s">%s</a> 撰写',
-                                Typecho_Common::url('manage-posts.php?uid=' . $post->author->uid, $options->adminUrl), $post->author->screenName); ?><br>
+                                \Typecho\Common::url('manage-posts.php?uid=' . $post->author->uid, $options->adminUrl), $post->author->screenName); ?><br>
                                 <?php _e('最后更新于 %s', $modified->word()); ?>
                             </p>
                         </section>
@@ -177,13 +177,13 @@ include 'common-js.php';
 include 'form-js.php';
 include 'write-js.php';
 
-Typecho_Plugin::factory('admin/write-post.php')->trigger($plugged)->richEditor($post);
+\Typecho\Plugin::factory('admin/write-post.php')->trigger($plugged)->richEditor($post);
 if (!$plugged) {
     include 'editor-js.php';
 }
 
 include 'file-upload-js.php';
 include 'custom-fields-js.php';
-Typecho_Plugin::factory('admin/write-post.php')->bottom($post);
+\Typecho\Plugin::factory('admin/write-post.php')->bottom($post);
 include 'footer.php';
 ?>
diff --git a/index.php b/index.php
index 79efa8b4..39d6998a 100644
--- a/index.php
+++ b/index.php
@@ -14,13 +14,13 @@ if (!defined('__TYPECHO_ROOT_DIR__') && !@include_once 'config.inc.php') {
 }
 
 /** 初始化组件 */
-Typecho_Widget::widget('Widget_Init');
+\Typecho\Widget::widget('Widget_Init');
 
 /** 注册一个初始化插件 */
-Typecho_Plugin::factory('index.php')->begin();
+\Typecho\Plugin::factory('index.php')->begin();
 
 /** 开始路由分发 */
-Typecho_Router::dispatch();
+\Typecho\Router::dispatch();
 
 /** 注册一个结束插件 */
-Typecho_Plugin::factory('index.php')->end();
+\Typecho\Plugin::factory('index.php')->end();