diff --git a/var/Typecho/Common.php b/var/Typecho/Common.php
index de792af2..4ee00d8f 100644
--- a/var/Typecho/Common.php
+++ b/var/Typecho/Common.php
@@ -437,22 +437,6 @@ EOF;
         return false;
     }
 
-    /**
-     * 检测是否在app engine上运行，屏蔽某些功能 
-     * 
-     * @static
-     * @access public
-     * @return boolean
-     */
-    public static function isAppEngine()
-    {
-        return !empty($_SERVER['HTTP_APPNAME'])                     // SAE
-            || !!getenv('HTTP_BAE_ENV_APPID')                       // BAE
-            || !!getenv('HTTP_BAE_LOGID')                           // BAE 3.0
-            || (isset($_SERVER['SERVER_SOFTWARE']) && strpos($_SERVER['SERVER_SOFTWARE'],'Google App Engine') !== false) // GAE
-            ;
-    }
-
     /**
      * 抽取多维数组的某个元素,组成一个新数组,使这个数组变成一个扁平数组
      * 使用方法:
diff --git a/var/Widget/Options/Permalink.php b/var/Widget/Options/Permalink.php
index 800617dc..64359181 100644
--- a/var/Widget/Options/Permalink.php
+++ b/var/Widget/Options/Permalink.php
@@ -122,7 +122,7 @@ class Widget_Options_Permalink extends Widget_Abstract_Options implements Widget
             $hasWrote = false;
 
             if (!file_exists(__TYPECHO_ROOT_DIR__ . '/.htaccess')
-                && !Typecho_Common::isAppEngine()) {
+                && strpos(php_sapi_name(), 'apache') !== false) {
                 if (is_writeable(__TYPECHO_ROOT_DIR__)) {
                     $parsed = parse_url($this->options->siteUrl);
                     $basePath = empty($parsed['path']) ? '/' : $parsed['path'];
diff --git a/var/Widget/Themes/Edit.php b/var/Widget/Themes/Edit.php
index 17c11644..abd6a13d 100644
--- a/var/Widget/Themes/Edit.php
+++ b/var/Widget/Themes/Edit.php
@@ -84,7 +84,7 @@ class Widget_Themes_Edit extends Widget_Abstract_Options implements Widget_Inter
     {
         $path = $this->options->themeFile($theme, $file);
 
-        if (file_exists($path) && is_writeable($path) && !Typecho_Common::isAppEngine()
+        if (file_exists($path) && is_writeable($path)
             && (!defined('__TYPECHO_THEME_WRITEABLE__') || __TYPECHO_THEME_WRITEABLE__)) {
             $handle = fopen($path, 'wb');
             if ($handle && fwrite($handle, $this->request->content)) {
diff --git a/var/Widget/Themes/Files.php b/var/Widget/Themes/Files.php
index f7b1a15c..1782b72f 100644
--- a/var/Widget/Themes/Files.php
+++ b/var/Widget/Themes/Files.php
@@ -112,7 +112,7 @@ class Widget_Themes_Files extends Typecho_Widget
     public function currentIsWriteable()
     {
         return is_writeable($this->widget('Widget_Options')
-            ->themeFile($this->_currentTheme, $this->_currentFile)) && !Typecho_Common::isAppEngine()
+            ->themeFile($this->_currentTheme, $this->_currentFile))
         && (!defined('__TYPECHO_THEME_WRITEABLE__') || __TYPECHO_THEME_WRITEABLE__);
     }
 
diff --git a/var/Widget/Upload.php b/var/Widget/Upload.php
index 2c3dcb83..970d9945 100644
--- a/var/Widget/Upload.php
+++ b/var/Widget/Upload.php
@@ -94,7 +94,7 @@ class Widget_Upload extends Widget_Abstract_Contents implements Widget_Interface
 
         $ext = self::getSafeName($file['name']);
 
-        if (!self::checkFileType($ext) || Typecho_Common::isAppEngine()) {
+        if (!self::checkFileType($ext)) {
             return false;
         }
 
@@ -172,7 +172,7 @@ class Widget_Upload extends Widget_Abstract_Contents implements Widget_Interface
 
         $ext = self::getSafeName($file['name']);
         
-        if ($content['attachment']->type != $ext || Typecho_Common::isAppEngine()) {
+        if ($content['attachment']->type != $ext) {
             return false;
         }
 
@@ -243,8 +243,7 @@ class Widget_Upload extends Widget_Abstract_Contents implements Widget_Interface
             return $result;
         }
 
-        return !Typecho_Common::isAppEngine() 
-            && @unlink(__TYPECHO_ROOT_DIR__ . '/' . $content['attachment']->path);
+        return @unlink(__TYPECHO_ROOT_DIR__ . '/' . $content['attachment']->path);
     }
 
     /**