diff --git a/app/demo.py b/app/demo.py
index c1c1884..aeecca4 100644
--- a/app/demo.py
+++ b/app/demo.py
@@ -38,6 +38,7 @@ def do_p2_im_message_receive_v1(data: P2ImMessageReceiveV1) -> None:
     content = data.event.message.content
     content = json.loads(content)
     if message_type == "post":
+        content = content["content"]
         for item in chain.from_iterable(data):
             if item.get("tag") == "text":
                 message_content += item["text"]