diff --git a/framework/base/router.class.php b/framework/base/router.class.php
index 9cab59b7cd..8ad62956e3 100644
--- a/framework/base/router.class.php
+++ b/framework/base/router.class.php
@@ -333,6 +333,15 @@ class baseRouter
      */
     public $dao;
 
+    /**
+     * $mao对象，用于访问或者更新缓存。
+     * The $mao object, used to access or update cache.
+     *
+     * @var mao
+     * @access public
+     */
+    public $mao;
+
     /**
      * 从数据库的句柄。
      * The slave database handler.