diff --git a/framework/control.class.php b/framework/control.class.php
index 76f24e658e..9d36e0bc4f 100644
--- a/framework/control.class.php
+++ b/framework/control.class.php
@@ -35,11 +35,7 @@ class control extends baseControl
 
         $this->app->setOpenApp();
 
-        if(defined('IN_USE') or (defined('RUN_MODE') and RUN_MODE != 'api'))
-        {
-            $this->setPreference();
-            $this->forceUpgrade();
-        }
+        if(defined('IN_USE') or (defined('RUN_MODE') and RUN_MODE != 'api')) $this->setPreference();
 
         if(!isset($this->config->bizVersion)) return false;
 
@@ -127,39 +123,6 @@ class control extends baseControl
         }
     }
 
-    /**
-     * If change the edition, trigger the upgrade process.
-     *
-     * @access public
-     * @return void
-     */
-    public function forceUpgrade()
-    {
-        $installedVersion = $this->loadModel('setting')->getVersion();
-
-        /* Means open source upgrade to biz or max. */
-        if(is_numeric($installedVersion[0]) and $this->config->edition != 'open')
-        {
-            $this->loadModel('setting')->setItem('system.common.global.version', $this->config->version);
-            $this->loadModel('effort')->convertEstToEffort();
-            $this->loadModel('upgrade')->importBuildinModules();
-            $this->upgrade->addSubStatus();
-        }
-
-        /* Max only has new system mode. */
-        if($installedVersion[0] != 'm' and $this->config->edition == 'max')
-        {
-            $this->loadModel('setting')->setItem('system.common.global.version', $this->config->version);
-            if($this->config->systemMode == 'classic' and $this->app->getModuleName() != 'upgrade')
-            {
-                $this->loadModel('setting')->setItem('system.common.global.mode', 'new');
-                $this->locate(helper::createLink('upgrade', 'mergeTips'));
-            }
-        }
-
-        return true;
-    }
-
     /**
      * 企业版部分功能是从然之合并过来的。然之代码中调用loadModel方法时传递了一个非空的appName，在禅道中会导致错误。
      * 调用父类的loadModel方法来避免这个错误。