diff --git a/scripts/demo_chat.py b/scripts/demo_chat.py
index 892083c..36f23a2 100644
--- a/scripts/demo_chat.py
+++ b/scripts/demo_chat.py
@@ -1,29 +1,41 @@
 import tyro
-import asyncio
-from loguru import logger
+from typing import Annotated
 
 from lang_agent.pipeline import Pipeline, PipelineConfig
 from lang_agent.config import load_tyro_conf
 
-def main(conf:PipelineConfig):
+
+def main(
+    conf: PipelineConfig,
+    stream: Annotated[bool, tyro.conf.arg(name="stream")] = True,
+):
+    """Demo chat script for langchain-agent pipeline.
+    
+    Args:
+        conf: Pipeline configuration
+        stream: Enable streaming mode for chat responses
+    """
     if conf.config_f is not None:
         conf = load_tyro_conf(conf.config_f)
     
-    pipeline:Pipeline = conf.setup()
+    pipeline: Pipeline = conf.setup()
     
     while True:
         user_input = input("请讲：")
         if user_input.lower() == "exit":
             break
-        response = pipeline.chat(user_input)
-        # print(f"回答: {response}")
-
-    # # out = pipeline.chat("用工具算6856854-416846等于多少;然后解释它是怎么算出来的", as_stream=True)
-    # out = pipeline.chat("你叫什么名字，我今天心情不好，而且天气也不好，我想去外面玩，帮我计划一下", as_stream=True)
-    # # out = pipeline.chat("testing", as_stream=True)
-    # print("=========== final ==========")
-    # print(out)
+        
+        if stream:
+            # Streaming mode: print chunks as they arrive
+            print("回答: ", end="", flush=True)
+            for chunk in pipeline.chat(user_input, as_stream=True):
+                print(chunk, end="", flush=True)
+            print()  # New line after streaming completes
+        else:
+            # Non-streaming mode: print full response
+            response = pipeline.chat(user_input, as_stream=False)
+            print(f"回答: {response}")
 
 
 if __name__ == "__main__":
-    main(tyro.cli(PipelineConfig))
\ No newline at end of file
+    tyro.cli(main)
\ No newline at end of file