diff --git a/channel/chat_channel.py b/channel/chat_channel.py
index a7f8694..1fcc619 100644
--- a/channel/chat_channel.py
+++ b/channel/chat_channel.py
@@ -252,7 +252,7 @@ class ChatChannel(Channel):
         session_id = context['session_id']
         with self.lock:
             if session_id not in self.sessions:
-                self.sessions[session_id] = [Dequeue(), threading.BoundedSemaphore(conf().get("concurrency_in_session", 1))]
+                self.sessions[session_id] = [Dequeue(), threading.BoundedSemaphore(conf().get("concurrency_in_session", 4))]
             if context.type == ContextType.TEXT and context.content.startswith("#"): 
                 self.sessions[session_id][0].putleft(context) # 优先处理管理命令
             else: