diff --git a/src/WeChat/Utility.php b/src/WeChat/Utility.php
index d08f748..87a1abd 100644
--- a/src/WeChat/Utility.php
+++ b/src/WeChat/Utility.php
@@ -51,6 +51,7 @@ public function generateSign(array $data): string
      */
     private function getSignContent(array $data): string
     {
+    	unset($data['sign']);
        return  urldecode(http_build_query($data));
        /*
         $buff = '';