diff --git a/asr/sherpa_ncnn_asr.py b/asr/sherpa_ncnn_asr.py
index 8abda87..eb77bf7 100644
--- a/asr/sherpa_ncnn_asr.py
+++ b/asr/sherpa_ncnn_asr.py
@@ -65,7 +65,7 @@ class SherpaNcnnAsr(AsrBase):
             self._notify_complete('介绍中国5000年历史文学')
             logger.info(f'_recognize_loop111')
             segment_id += 1
-            time.sleep(5)
+            time.sleep(50)
             logger.info(f'_recognize_loop222')
         logger.info(f'_recognize_loop exit')
 '''
diff --git a/human_handler/audio_handler.py b/human_handler/audio_handler.py
index 2accd5c..f2e307e 100644
--- a/human_handler/audio_handler.py
+++ b/human_handler/audio_handler.py
@@ -18,13 +18,6 @@ class AudioHandler(ABC):
         if self._handler is not None:
             self._handler.on_message(message)
 
-    # @abstractmethod
-    # def pause_handle(self):
-    #     if self._handler is not None:
-    #         self._handler.pause_handle()
-    #     else:
-    #         logging.info(f'_handler is None')
-
     @abstractmethod
     def stop(self):
         pass
diff --git a/nlp/nlp_base.py b/nlp/nlp_base.py
index 7ef3942..c545211 100644
--- a/nlp/nlp_base.py
+++ b/nlp/nlp_base.py
@@ -13,6 +13,7 @@ class NLPBase(AsrObserver):
         self._context = context
         self._split_handle = split
         self._callback = callback
+        self._is_running = False
 
     @property
     def callback(self):
@@ -23,7 +24,7 @@ class NLPBase(AsrObserver):
         self._callback = value
 
     def _on_callback(self, txt: str):
-        if self._callback is not None:
+        if self._callback is not None and self._is_running:
             self._callback.on_message(txt)
 
     async def _request(self, question):
@@ -42,14 +43,18 @@ class NLPBase(AsrObserver):
 
     def ask(self, question):
         logger.info(f'ask:{question}')
+        self._is_running = True
         self._ask_queue.add_task(self._request, question)
         logger.info(f'ask:{question} completed')
 
     def stop(self):
         logger.info('NLPBase stop')
+        self._is_running = False
         self._ask_queue.add_task(self._on_close)
         self._ask_queue.stop()
 
     def pause_talk(self):
+        logger.info('NLPBase pause_talk')
+        self._is_running = False
         self._ask_queue.clear()
     
\ No newline at end of file
diff --git a/tts/tts_base.py b/tts/tts_base.py
index 9cebe93..db7a2c0 100644
--- a/tts/tts_base.py
+++ b/tts/tts_base.py
@@ -13,6 +13,7 @@ class TTSBase(NLPCallback):
     def __init__(self, handle):
         self._handle = handle
         self._message_queue = AsyncTaskQueue(5)
+        self._is_running = False
 
     @property
     def handle(self):
@@ -30,7 +31,10 @@ class TTSBase(NLPCallback):
             print(f'-------stream is None')
             return
         print(f'-------tts time:{time.time() - t:.4f}s')
-        await self._on_handle(stream, index)
+        if self._handle is not None and self._is_running:
+            await self._on_handle(stream, index)
+        else:
+            logger.info(f'handle is None, running:{self._is_running}')
 
     async def _on_request(self, text: str):
         pass
@@ -45,6 +49,7 @@ class TTSBase(NLPCallback):
         self.message(txt)
 
     def message(self, txt):
+        self._is_running = True
         txt = txt.strip()
         if len(txt) == 0:
             logger.info(f'message is empty')
@@ -61,4 +66,6 @@ class TTSBase(NLPCallback):
         self._message_queue.stop()
 
     def pause_talk(self):
+        logger.info(f'TTSBase pause_talk')
+        self._is_running = False
         self._message_queue.clear()
diff --git a/ui/__init__.py b/ui/__init__.py
new file mode 100644
index 0000000..865208a
--- /dev/null
+++ b/ui/__init__.py
@@ -0,0 +1,3 @@
+#encoding = utf8
+
+