diff --git a/channel/chat_channel.py b/channel/chat_channel.py
index 6d904d3..4aa17be 100644
--- a/channel/chat_channel.py
+++ b/channel/chat_channel.py
@@ -202,8 +202,10 @@ class ChatChannel(Channel):
                         reply = self._generate_reply(new_context)
                     else:
                         return
-            elif context.type == ContextType.IMAGE or context.type == ContextType.FUNCTION \
-                    or context.type == ContextType.FILE:  # 图片/文件消息及函数调用等，当前无默认逻辑
+            elif context.type == ContextType.IMAGE:  # 图片消息，当前仅做下载保存到本地的逻辑
+                cmsg = context["msg"]
+                cmsg.prepare()
+            elif context.type == ContextType.FUNCTION or context.type == ContextType.FILE:  # 文件消息及函数调用等，当前无默认逻辑
                 pass
             else:
                 logger.error("[WX] unknown context type: {}".format(context.type))
diff --git a/channel/wework/wework_message.py b/channel/wework/wework_message.py
index e9f1187..dd24aa4 100644
--- a/channel/wework/wework_message.py
+++ b/channel/wework/wework_message.py
@@ -39,16 +39,16 @@ def get_room_info(wework, conversation_id):
 
 def cdn_download(wework, message, file_name):
     data = message["data"]
-    url = data["cdn"]["url"]
-    auth_key = data["cdn"]["auth_key"]
     aes_key = data["cdn"]["aes_key"]
     file_size = data["cdn"]["size"]
+    file_type = 2
+    file_id = data["cdn"]["file_id"]
 
     # 获取当前工作目录，然后与文件名拼接得到保存路径
     current_dir = os.getcwd()
     save_path = os.path.join(current_dir, "tmp", file_name)
 
-    result = wework.wx_cdn_download(url, auth_key, aes_key, file_size, save_path)
+    result = wework.c2c_cdn_download(file_id, aes_key, file_size, file_type, save_path)
     logger.debug(result)