diff --git a/src/Wechat/Work/Chat.php b/src/Wechat/Work/Chat.php
index 4b98456..757bc8f 100644
--- a/src/Wechat/Work/Chat.php
+++ b/src/Wechat/Work/Chat.php
@@ -4,18 +4,20 @@ namespace Wechat\Work;
 
 use Wechat\Work\Message\MessageInterface;
 
-class Chat extends Base
+class Chat
 {
 
     protected $id;
+    protected $work;
 
-    public function __construct($id = null)
+    public function __construct($id, $work)
     {
-        parent::__construct();
+        $this->work = $work;
         $this->id = $id;
     }
 
     /**
+     * 发送消息
      * @param $msg MessageInterface
      * @return mixed
      */
@@ -58,14 +60,6 @@ class Chat extends Base
         return json_decode($resp->getBody(), true);
     }
 
-    public function send(Message $message)
-    {
-        $request = $this->transformForJsonRequest('POST', 'appchat/send',
-            array_merge(['chatid' => $this->id], $message->toArray()));
-        $resp = $this->client->send($request);
-        return json_decode($resp->getBody(), true);
-    }
-
     public function update($chatId, array $add = null, array $del = null, $name = null, $owner = null)
     {
         $params = [
diff --git a/src/Wechat/Work/Message/MessageInterface.php b/src/Wechat/Work/Message/MessageInterface.php
index 6806c02..b61fc35 100644
--- a/src/Wechat/Work/Message/MessageInterface.php
+++ b/src/Wechat/Work/Message/MessageInterface.php
@@ -16,7 +16,7 @@ abstract class MessageInterface
 
     protected $type;
 
-    protected $params;
+    protected $params = [];
     protected $attr;
 
     public function toUser($user)
diff --git a/src/Wechat/Work/Work.php b/src/Wechat/Work/Work.php
index b0aa858..a54ee48 100644
--- a/src/Wechat/Work/Work.php
+++ b/src/Wechat/Work/Work.php
@@ -10,9 +10,21 @@ class Work extends Base
         parent::__construct($config);
     }
 
+    /**
+     * 消息推送
+     * @return Message
+     */
     public function message()
     {
         return new Message($this);
     }
 
+    /**
+     *  群聊接口
+     */
+    public function chat($id)
+    {
+        return new Chat($id, $this);
+    }
+
 }
\ No newline at end of file