diff --git a/lib/Lib/Core/Controller.js b/lib/Lib/Core/Controller.js
index 573ff937..564cb013 100644
--- a/lib/Lib/Core/Controller.js
+++ b/lib/Lib/Core/Controller.js
@@ -69,7 +69,7 @@ module.exports = Class(function() {
          * @return {Boolean} [description]
          */
         isAjax: function() {
-            return this.header("X-Requested-With").toLowerCase() === "xmlhttprequest";
+            return this.header("x-requested-with") === "XMLHttpRequest";
         },
         /**
          * 获取QUERY参数