diff --git a/var/Typecho/Db/Query.php b/var/Typecho/Db/Query.php
index 3a6f45d9..d110bb92 100644
--- a/var/Typecho/Db/Query.php
+++ b/var/Typecho/Db/Query.php
@@ -26,6 +26,26 @@ class Typecho_Db_Query
     /** 数据库关键字 */
     const KEYWORDS = '*PRIMARY|AND|OR|LIKE|BINARY|BY|DISTINCT|AS|IN|IS|NULL';
 
+    /**
+     * 默认字段 
+     * 
+     * @var array
+     * @access private
+     */
+    private $_default = array(
+        'action' => NULL,
+        'table'  => NULL,
+        'fields' => '*',
+        'join'   => array(),
+        'where'  => NULL,
+        'limit'  => NULL,
+        'offset' => NULL,
+        'order'  => NULL,
+        'group'  => NULL,
+        'having'  => NULL,
+        'rows'   => array(),
+    );
+
     /**
      * 数据库适配器
      *
@@ -60,19 +80,7 @@ class Typecho_Db_Query
         $this->_adapter = &$adapter;
         $this->_prefix = $prefix;
 
-        $this->_sqlPreBuild = array(
-            'action' => NULL,
-            'table'  => NULL,
-            'fields' => '*',
-            'join'   => array(),
-            'where'  => NULL,
-            'limit'  => NULL,
-            'offset' => NULL,
-            'order'  => NULL,
-            'group'  => NULL,
-            'having'  => NULL,
-            'rows'   => array(),
-        );
+        $this->_sqlPreBuild = $this->_default;
     }
 
     /**
@@ -203,6 +211,21 @@ class Typecho_Db_Query
         return isset($this->_sqlPreBuild[$attributeName]) ? $this->_sqlPreBuild[$attributeName] : NULL;
     }
 
+    /**
+     * 清除查询字串属性值
+     *
+     * @access public
+     * @param string $attributeName 属性名称
+     * @return Typecho_Db_Query
+     */
+    public function cleanAttribute($attributeName)
+    {
+        if (isset($this->_sqlPreBuild[$attributeName])) {
+            $this->_sqlPreBuild[$attributeName] = $this->_default[$attributeName];
+        }
+        return $this;
+    }
+
     /**
      * 连接表
      *
diff --git a/var/Widget/Abstract/Contents.php b/var/Widget/Abstract/Contents.php
index b4cf541d..66b6a275 100644
--- a/var/Widget/Abstract/Contents.php
+++ b/var/Widget/Abstract/Contents.php
@@ -576,7 +576,10 @@ class Widget_Abstract_Contents extends Widget_Abstract
      */
     public function size(Typecho_Db_Query $condition)
     {
-        return $this->db->fetchObject($condition->select(array('COUNT(table.contents.cid)' => 'num'))->from('table.contents'))->num;
+        return $this->db->fetchObject($condition
+            ->select(array('COUNT(DISTINCT table.contents.cid)' => 'num'))
+            ->from('table.contents')
+            ->cleanAttribute('group'))->num;
     }
     
     /**
@@ -612,18 +615,24 @@ class Widget_Abstract_Contents extends Widget_Abstract
     public function filter(array $value)
     {
         /** 取出所有分类 */
-        $value['categories'] = $this->db->fetchAll($this->db
-        ->select()->from('table.metas')
-        ->join('table.relationships', 'table.relationships.mid = table.metas.mid')
-        ->where('table.relationships.cid = ?', $value['cid'])
-        ->where('table.metas.type = ?', 'category')
-        ->order('table.metas.order', Typecho_Db::SORT_ASC), array($this->widget('Widget_Metas_Category_List'), 'filter'));
+        if ('post' == $value['type']) {
+            $value['categories'] = $this->db->fetchAll($this->db
+            ->select()->from('table.metas')
+            ->join('table.relationships', 'table.relationships.mid = table.metas.mid')
+            ->where('table.relationships.cid = ?', $value['cid'])
+            ->where('table.metas.type = ?', 'category')
+            ->order('table.metas.order', Typecho_Db::SORT_ASC), array($this->widget('Widget_Metas_Category_List'), 'filter'));
+        }
+        $value['category'] = NULL;
+        $value['directory'] = array();
 
         /** 取出第一个分类作为slug条件 */
-        $value['category'] = $value['categories'][0]['slug'];
+        if (!empty($value['categories'])) {
+            $value['category'] = $value['categories'][0]['slug'];
 
-        $value['directory'] = $this->widget('Widget_Metas_Category_List')->getAllParents($value['category']['mid']);
-        $value['directory'][] = $value['category'];
+            $value['directory'] = $this->widget('Widget_Metas_Category_List')->getAllParents($value['categories'][0]['mid']);
+            $value['directory'][] = $value['category'];
+        }
 
         $value['date'] = new Typecho_Date($value['created']);
 
diff --git a/var/Widget/Archive.php b/var/Widget/Archive.php
index a63cccc8..d4504faf 100644
--- a/var/Widget/Archive.php
+++ b/var/Widget/Archive.php
@@ -890,7 +890,8 @@ class Widget_Archive extends Widget_Abstract_Contents
         /** fix sql92 by 70 */
         $select->join('table.relationships', 'table.contents.cid = table.relationships.cid')
         ->where('table.relationships.mid IN ?', $children)
-        ->where('table.contents.type = ?', 'post');
+        ->where('table.contents.type = ?', 'post')
+        ->group('table.contents.cid');
 
         /** 设置分页 */
         $this->_pageRow = array_merge($category, array(