diff --git a/paddlespeech/server/bin/paddlespeech_client.py b/paddlespeech/server/bin/paddlespeech_client.py
index f0a206b7..6d730959 100644
--- a/paddlespeech/server/bin/paddlespeech_client.py
+++ b/paddlespeech/server/bin/paddlespeech_client.py
@@ -33,7 +33,6 @@ from paddlespeech.cli.log import logger
 from paddlespeech.server.utils.audio_handler import ASRWsAudioHandler
 from paddlespeech.server.utils.audio_process import wav2pcm
 from paddlespeech.server.utils.util import compute_delay
-from paddlespeech.server.utils.util import network_reachable
 from paddlespeech.server.utils.util import wav2base64
 
 __all__ = [
@@ -157,12 +156,6 @@ class TTSClientExecutor(BaseExecutor):
             "save_path": output
         }
 
-        # Check if the network is reachable
-        network = 'http://' + server_ip + ":" + str(port)
-        if network_reachable(network) is not True:
-            logger.error(f"{network} unreachable, please check the ip address.")
-            sys.exit(-1)
-
         res = requests.post(url, json.dumps(request))
         response_dict = res.json()
         if output is not None:
@@ -264,12 +257,6 @@ class TTSOnlineClientExecutor(BaseExecutor):
         Python API to call an executor.
         """
 
-        # Check if the network is reachable
-        network = 'http://' + server_ip + ":" + str(port)
-        if network_reachable(network) is not True:
-            logger.error(f"{network} unreachable, please check the ip address.")
-            sys.exit(-1)
-
         if protocol == "http":
             logger.info("tts http client start")
             from paddlespeech.server.utils.audio_handler import TTSHttpHandler
@@ -415,13 +402,6 @@ class ASRClientExecutor(BaseExecutor):
         # and paddlespeech_client asr only support http protocol
         protocol = "http"
         if protocol.lower() == "http":
-            # Check if the network is reachable
-            network = 'http://' + server_ip + ":" + str(port)
-            if network_reachable(network) is not True:
-                logger.error(
-                    f"{network} unreachable, please check the ip address.")
-                sys.exit(-1)
-
             from paddlespeech.server.utils.audio_handler import ASRHttpHandler
             logger.info("asr http client start")
             handler = ASRHttpHandler(server_ip=server_ip, port=port)
@@ -527,12 +507,6 @@ class ASROnlineClientExecutor(BaseExecutor):
             str: the audio text
         """
 
-        # Check if the network is reachable
-        network = 'http://' + server_ip + ":" + str(port)
-        if network_reachable(network) is not True:
-            logger.error(f"{network} unreachable, please check the ip address.")
-            sys.exit(-1)
-
         logger.info("asr websocket client start")
         handler = ASRWsAudioHandler(
             server_ip,
@@ -598,12 +572,6 @@ class CLSClientExecutor(BaseExecutor):
         Python API to call an executor.
         """
 
-        # Check if the network is reachable
-        network = 'http://' + server_ip + ":" + str(port)
-        if network_reachable(network) is not True:
-            logger.error(f"{network} unreachable, please check the ip address.")
-            sys.exit(-1)
-
         url = 'http://' + server_ip + ":" + str(port) + '/paddlespeech/cls'
         audio = wav2base64(input)
         data = {"audio": audio, "topk": topk}
@@ -669,12 +637,6 @@ class TextClientExecutor(BaseExecutor):
             str: the punctuation text
         """
 
-        # Check if the network is reachable
-        network = 'http://' + server_ip + ":" + str(port)
-        if network_reachable(network) is not True:
-            logger.error(f"{network} unreachable, please check the ip address.")
-            sys.exit(-1)
-
         url = 'http://' + server_ip + ":" + str(port) + '/paddlespeech/text'
         request = {
             "text": input,
@@ -772,12 +734,6 @@ class VectorClientExecutor(BaseExecutor):
             str: the audio embedding or score between enroll and test audio
         """
 
-        # Check if the network is reachable
-        network = 'http://' + server_ip + ":" + str(port)
-        if network_reachable(network) is not True:
-            logger.error(f"{network} unreachable, please check the ip address.")
-            sys.exit(-1)
-
         if task == "spk":
             from paddlespeech.server.utils.audio_handler import VectorHttpHandler
             logger.info("vector http client start")
diff --git a/paddlespeech/server/utils/util.py b/paddlespeech/server/utils/util.py
index 3f2603b4..061b213c 100644
--- a/paddlespeech/server/utils/util.py
+++ b/paddlespeech/server/utils/util.py
@@ -13,8 +13,6 @@
 import base64
 import math
 
-import requests
-
 
 def wav2base64(wav_file: str):
     """
@@ -148,21 +146,3 @@ def count_engine(logfile: str="./nohup.out"):
     print(
         f"max final response: {max(final_response_list)} s, min final response: {min(final_response_list)} s"
     )
-
-
-def network_reachable(url: str, timeout: int=5) -> bool:
-    """Check if the network is reachable
-
-    Args:
-        url (str): http://server_ip:port or ws://server_ip:port
-        timeout (int, optional): timeout. Defaults to 5.
-
-    Returns:
-        bool: Whether the network is reachable.
-    """
-    try:
-        request = requests.get(url, timeout=timeout)
-        return True
-    except (requests.ConnectionError, requests.Timeout) as exception:
-        print(exception)
-        return False
diff --git a/paddlespeech/server/ws/tts_api.py b/paddlespeech/server/ws/tts_api.py
index 33b30ce4..b43c7445 100644
--- a/paddlespeech/server/ws/tts_api.py
+++ b/paddlespeech/server/ws/tts_api.py
@@ -68,6 +68,10 @@ async def websocket_endpoint(websocket: WebSocket):
                         "session": session
                     }
                     await websocket.send_json(resp)
+                    break
+                else:
+                    resp = {"status": 0, "signal": "no valid json data"}
+                    await websocket.send_json(resp)
 
             # speech synthesis request 
             elif 'text' in message:
@@ -83,10 +87,12 @@ async def websocket_endpoint(websocket: WebSocket):
                         resp = {"status": 1, "audio": tts_results}
                         await websocket.send_json(resp)
                     except StopIteration as e:
+                        import pdb
+                        pdb.set_trace()
                         resp = {"status": 2, "audio": ''}
                         await websocket.send_json(resp)
                         logger.info(
-                            "Complete the transmission of audio streams")
+                            "Complete the synthesis of the audio streams")
                         break
 
             else: