diff --git a/ThinkPHP/Library/Org/Kudian/Request/Request.class.php b/ThinkPHP/Library/Org/Kudian/Request/Request.class.php
index a61c7df..f9ebc35 100644
--- a/ThinkPHP/Library/Org/Kudian/Request/Request.class.php
+++ b/ThinkPHP/Library/Org/Kudian/Request/Request.class.php
@@ -52,7 +52,7 @@ class Request
             'timestamp' => $this->timestamp,
             'nonce_str' => $this->nonceStr,
             'sign_type' => $this->signType,
-            'content' => $this->content,
+            'content' => json_encode($this->content),
         ];
         $params[Sign::SIGN_KEY] = Sign::generate($params, $this->secretKey);
         return $params;