diff --git a/webapp/index.php b/webapp/index.php
index f1a7ab11..e7dfc0bf 100644
--- a/webapp/index.php
+++ b/webapp/index.php
@@ -22,6 +22,12 @@ function autoload_controller__($classname)
 }
 spl_autoload_register('autoload_controller__');
 
+function isValidActionAction($a, $method) {
+    return $method && $method->isPublic() &&
+        $a[0] != '_' &&
+        (!$method->isConstructor() && !$method->isDestructor());
+}
+
 try{
     $c = $_REQUEST['c'];
     $a = $_REQUEST['a'];
@@ -37,12 +43,19 @@ try{
     $beginTick = phpcommon\getTickCount();
     $obj = eval('return new $classname();');
     $method = new ReflectionMethod($classname, $a);
-    if ($method && $method->isPublic() &&
-        $a[0] != '_' &&
-        (!$method->isConstructor() && !$method->isDestructor())) {
+    $methodS = new ReflectionMethod($classname, $a . 'S');
+    if (isValidActionAction($a, $method)) {
         $obj->_handlePre();
         $method->invoke($obj);
         $obj->_handlePost();
+    } else if (isValidActionAction($a, $methodS)) {
+        //如果原版函数不存在并且S版函数存在，则自动切换为S版
+        echo json_encode(array(
+            'errcode' => 1006,
+            'errmsg' => 'already upgrade to safe api',
+            'payload' => 1,
+        ));
+        die();
     }
 } catch (Exception $e){
     error_log($e);