diff --git a/backend/app/agent/agent_service.py b/backend/app/agent/agent_service.py
index d32e7ff..6c1d2ca 100644
--- a/backend/app/agent/agent_service.py
+++ b/backend/app/agent/agent_service.py
@@ -254,6 +254,8 @@ class AIAgentService:
         try:
             info(f"📡 开始调用 graph.astream()...")
             
+            event_count = 0
+            
             async for chunk in self.graph.astream(
                 input_state,
                 config=config,
@@ -263,6 +265,10 @@ class AIAgentService:
             ):
                 chunk_count += 1
                 chunk_type = chunk["type"]
+                
+                # 记录原始 chunk 信息（前 10 个和后 10 个）
+                if chunk_count <= 10 or chunk_count % 50 == 0:
+                    info(f"  [{chunk_count}] chunk_type={chunk_type}, data={type(chunk.get('data'))}")
 
                 if chunk_type == "messages":
                     async for event in self._handle_message_chunk(
@@ -271,6 +277,11 @@ class AIAgentService:
                         if event.get("type") == "_update_state":
                             current_node = event.get("current_node", current_node)
                         else:
+                            event_count += 1
+                            # 记录前 10 个事件
+                            if event_count <= 10:
+                                info(f"    → yield event #{event_count}: {event.get('type')}")
+                            
                             # 如果是 agent 节点的 token，收集完整消息
                             if (
                                 event.get("type") == "llm_token"
@@ -287,10 +298,13 @@ class AIAgentService:
                         if event.get("type") == "_update_state":
                             actual_model_used = event.get("actual_model_used", actual_model_used)
                         else:
+                            event_count += 1
+                            if event_count <= 10:
+                                info(f"    → yield event #{event_count}: {event.get('type')}")
                             yield event
 
             # 完整消息集合完成后，一次性打印
-            info(f"✅ graph.astream() 完成，共 {chunk_count} 个 chunks")
+            info(f"✅ graph.astream() 完成，共 {chunk_count} 个 chunks, {event_count} 个 events")
             if full_message_content:
                 info(f"📄 完整消息内容: {repr(full_message_content)}")