diff --git a/app/Library/OAuth.php b/app/Library/OAuth.php
index e885ea43..1543c937 100644
--- a/app/Library/OAuth.php
+++ b/app/Library/OAuth.php
@@ -56,6 +56,13 @@ abstract class OAuth
 
     public function checkState($state)
     {
+        /**
+         * 注意事项：
+         * callback中的state参数并未做encode处理，参数中含有"+"
+         * 获取参数的时候却自动做了decode处理，"+"变成了空格
+         */
+        $state = str_replace(' ', '+', $state);
+
         /**
          * @var $crypt Crypt
          */