diff --git a/Library/Think/Loader.php b/Library/Think/Loader.php
index 786cb199..93fb86e6 100644
--- a/Library/Think/Loader.php
+++ b/Library/Think/Loader.php
@@ -190,7 +190,7 @@ class Loader {
      * @param string $layer 要调用的控制层名称
      * @return mixed
      */
-    static public function action($url, $vars = [], $layer = '') {
+    static public function action($url, $vars = [], $layer = 'Controller') {
         $info   = pathinfo($url);
         $action = $info['basename'];
         $module = '.' != $info['dirname'] ? $info['dirname'] : CONTROLLER_NAME;
diff --git a/base.php b/base.php
index 803f6e4c..ff7c0fc7 100644
--- a/base.php
+++ b/base.php
@@ -98,7 +98,7 @@ function D($name='',$layer='Model') {
  * @param string $layer 控制层名称
  * @return object
  */
-function A($name,$layer='') {
+function A($name,$layer='Controller') {
     return Think\Loader::controller($name,$layer);
 }
 
@@ -109,7 +109,7 @@ function A($name,$layer='') {
  * @param string $layer 要调用的控制层名称
  * @return mixed
  */
-function R($url,$vars=[],$layer='') {
+function R($url,$vars=[],$layer='Controller') {
     return Think\Loader::action($url,$vars,$layer);
 }