diff --git a/nanobot/channels/qq.py b/nanobot/channels/qq.py
index 7b171bc..99a712b 100644
--- a/nanobot/channels/qq.py
+++ b/nanobot/channels/qq.py
@@ -56,6 +56,7 @@ class QQChannel(BaseChannel):
         self.config: QQConfig = config
         self._client: "botpy.Client | None" = None
         self._processed_ids: deque = deque(maxlen=1000)
+        self._msg_seq: int = 1  # Message sequence to avoid QQ API deduplication
 
     async def start(self) -> None:
         """Start the QQ bot."""