diff --git a/wchat/officialaccount/Tag.php b/wchat/officialaccount/Tag.php
index 1d58044..e33d144 100644
--- a/wchat/officialaccount/Tag.php
+++ b/wchat/officialaccount/Tag.php
@@ -32,7 +32,8 @@ class Tag extends AfficialAccount
 		$this->request->setErrorField('errcode');
 		$this->request->setErrorMsgField('errmsg');
 
-		return $this->request->post($this->generate_url . $config, $params);
+		$this->request->setData(json_encode($params));
+		return $this->request->post($this->generate_url . $config);
 	}
 
 	/**