diff --git a/paddlespeech/server/bin/main.py b/paddlespeech/server/bin/main.py
deleted file mode 100644
index 81824c85c46687ff12d2ffd366743eaf237dbd9a..0000000000000000000000000000000000000000
--- a/paddlespeech/server/bin/main.py
+++ /dev/null
@@ -1,77 +0,0 @@
-# Copyright (c) 2022 PaddlePaddle Authors. All Rights Reserved.
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-import argparse
-
-import uvicorn
-from fastapi import FastAPI
-
-from paddlespeech.server.engine.engine_pool import init_engine_pool
-from paddlespeech.server.restful.api import setup_router as setup_http_router
-from paddlespeech.server.utils.config import get_config
-from paddlespeech.server.ws.api import setup_router as setup_ws_router
-
-app = FastAPI(
-    title="PaddleSpeech Serving API", description="Api", version="0.0.1")
-
-
-def init(config):
-    """system initialization
-
-    Args:
-        config (CfgNode): config object
-
-    Returns:
-        bool: 
-    """
-    # init api
-    api_list = list(engine.split("_")[0] for engine in config.engine_list)
-    if config.protocol == "websocket":
-        api_router = setup_ws_router(api_list)
-    elif config.protocol == "http":
-        api_router = setup_http_router(api_list)
-    else:
-        raise Exception("unsupported protocol")
-    app.include_router(api_router)
-
-    if not init_engine_pool(config):
-        return False
-
-    return True
-
-
-def main(args):
-    """main function"""
-
-    config = get_config(args.config_file)
-
-    if init(config):
-        uvicorn.run(app, host=config.host, port=config.port, debug=True)
-
-
-if __name__ == "__main__":
-    parser = argparse.ArgumentParser()
-    parser.add_argument(
-        "--config_file",
-        action="store",
-        help="yaml file of the app",
-        default="./conf/application.yaml")
-
-    parser.add_argument(
-        "--log_file",
-        action="store",
-        help="log file",
-        default="./log/paddlespeech.log")
-    args = parser.parse_args()
-
-    main(args)
diff --git a/paddlespeech/server/restful/api.py b/paddlespeech/server/restful/api.py
index f1e4ffc869556121654870dd0e638c60bc016ca1..63f865e8a3fe7929d00630af8594afef9694b564 100644
--- a/paddlespeech/server/restful/api.py
+++ b/paddlespeech/server/restful/api.py
@@ -29,19 +29,19 @@ def setup_router(api_list: List):
     """setup router for fastapi
 
     Args:
-        api_list (List): [asr, tts, cls]
+        api_list (List): [asr, tts, cls, text, vecotr]
 
     Returns:
         APIRouter
     """
     for api_name in api_list:
-        if api_name == 'asr':
+        if api_name.lower() == 'asr':
             _router.include_router(asr_router)
-        elif api_name == 'tts':
+        elif api_name.lower() == 'tts':
             _router.include_router(tts_router)
-        elif api_name == 'cls':
+        elif api_name.lower() == 'cls':
             _router.include_router(cls_router)
-        elif api_name == 'text':
+        elif api_name.lower() == 'text':
             _router.include_router(text_router)
         elif api_name.lower() == 'vector':
             _router.include_router(vec_router)
diff --git a/paddlespeech/server/utils/audio_handler.py b/paddlespeech/server/utils/audio_handler.py
index 75f4a10bebe3db1759bfe948a471087b7abe3ec2..2bce28e303c089fa0e64e9d8f20b5c3fdcf315ad 100644
--- a/paddlespeech/server/utils/audio_handler.py
+++ b/paddlespeech/server/utils/audio_handler.py
@@ -43,6 +43,7 @@ class TextHttpHandler:
         else:
             self.url = 'http://' + self.server_ip + ":" + str(
                 self.port) + '/paddlespeech/text'
+        logger.info(f"endpoint: {self.url}")
 
     def run(self, text):
         """Call the text server to process the specific text
@@ -107,8 +108,10 @@ class ASRWsAudioHandler:
         """
         samples, sample_rate = soundfile.read(wavfile_path, dtype='int16')
         x_len = len(samples)
+        assert sample_rate == 16000
+
+        chunk_size = int(85 * sample_rate / 1000)  # 85ms, sample_rate = 16kHz
 
-        chunk_size = 85 * 16  #80ms, sample_rate = 16kHz
         if x_len % chunk_size != 0:
             padding_len_x = chunk_size - x_len % chunk_size
         else:
@@ -217,6 +220,7 @@ class ASRHttpHandler:
         else:
             self.url = 'http://' + self.server_ip + ":" + str(
                 self.port) + '/paddlespeech/asr'
+        logger.info(f"endpoint: {self.url}")
 
     def run(self, input, audio_format, sample_rate, lang):
         """Call the http asr to process the audio
@@ -275,6 +279,7 @@ class TTSWsHandler:
             self.start_play = True
             self.t = threading.Thread(target=self.play_audio)
             self.max_fail = 50
+        logger.info(f"endpoint: {self.url}")
 
     def play_audio(self):
         while True:
@@ -383,6 +388,7 @@ class TTSHttpHandler:
             self.start_play = True
             self.t = threading.Thread(target=self.play_audio)
             self.max_fail = 50
+        logger.info(f"endpoint: {self.url}")
 
     def play_audio(self):
         while True:
@@ -483,6 +489,7 @@ class VectorHttpHandler:
         else:
             self.url = 'http://' + self.server_ip + ":" + str(
                 self.port) + '/paddlespeech/vector'
+        logger.info(f"endpoint: {self.url}")
 
     def run(self, input, audio_format, sample_rate, task="spk"):
         """Call the http asr to process the audio
@@ -529,6 +536,7 @@ class VectorScoreHttpHandler:
         else:
             self.url = 'http://' + self.server_ip + ":" + str(
                 self.port) + '/paddlespeech/vector/score'
+        logger.info(f"endpoint: {self.url}")
 
     def run(self, enroll_audio, test_audio, audio_format, sample_rate):
         """Call the http asr to process the audio
diff --git a/paddlespeech/server/utils/audio_process.py b/paddlespeech/server/utils/audio_process.py
index 6fb5bb832af4caab8d3b9065cd5a9630ccf2a311..bb02d66464814f0974cfb12ac6cf3d72f2dbf1e2 100644
--- a/paddlespeech/server/utils/audio_process.py
+++ b/paddlespeech/server/utils/audio_process.py
@@ -107,7 +107,7 @@ def change_speed(sample_raw, speed_rate, sample_rate):
 
 
 def float2pcm(sig, dtype='int16'):
-    """Convert floating point signal with a range from -1 to 1 to PCM.
+    """Convert floating point signal with a range from -1 to 1 to PCM16.
 
     Args:
         sig (array): Input array, must have floating point type.
diff --git a/paddlespeech/server/utils/buffer.py b/paddlespeech/server/utils/buffer.py
index d4e6cd4934a7b449482bac77e4c3a94797e12d08..f56db752d48ea1eb5ee9fbd3786d860c8cdbd7a2 100644
--- a/paddlespeech/server/utils/buffer.py
+++ b/paddlespeech/server/utils/buffer.py
@@ -12,7 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-
 class Frame(object):
     """Represents a "frame" of audio data."""
 
@@ -46,8 +45,7 @@ class ChunkBuffer(object):
         self.shift_ms = shift_ms
         self.sample_rate = sample_rate
         self.sample_width = sample_width  # int16 = 2; float32 = 4
-        self.remained_audio = b''
-
+        
         self.window_sec = float((self.window_n - 1) * self.shift_ms +
                                 self.window_ms) / 1000.0
         self.shift_sec = float(self.shift_n * self.shift_ms / 1000.0)
@@ -57,22 +55,31 @@ class ChunkBuffer(object):
         self.shift_bytes = int(self.shift_sec * self.sample_rate *
                                self.sample_width)
 
+        self.remained_audio = b''
+        # abs timestamp from `start` or latest `reset`
+        self.timestamp = 0.0
+
+    def reset(self):
+        """
+            reset buffer state.
+        """
+        self.timestamp = 0.0
+        self.remained_audio = b''
+
     def frame_generator(self, audio):
         """Generates audio frames from PCM audio data.
         Takes the desired frame duration in milliseconds, the PCM data, and
         the sample rate.
         Yields Frames of the requested duration.
         """
-
         audio = self.remained_audio + audio
         self.remained_audio = b''
 
         offset = 0
-        timestamp = 0.0
         while offset + self.window_bytes <= len(audio):
-            yield Frame(audio[offset:offset + self.window_bytes], timestamp,
+            yield Frame(audio[offset:offset + self.window_bytes], self.timestamp,
                         self.window_sec)
-            timestamp += self.shift_sec
+            self.timestamp += self.shift_sec
             offset += self.shift_bytes
 
         self.remained_audio += audio[offset:]
diff --git a/paddlespeech/server/ws/api.py b/paddlespeech/server/ws/api.py
index 313fd16f55b117b30cddccaeba404f7ee9762b5d..83d542a110c1bd625314ee9202456db997224072 100644
--- a/paddlespeech/server/ws/api.py
+++ b/paddlespeech/server/ws/api.py
@@ -15,8 +15,8 @@ from typing import List
 
 from fastapi import APIRouter
 
-from paddlespeech.server.ws.asr_socket import router as asr_router
-from paddlespeech.server.ws.tts_socket import router as tts_router
+from paddlespeech.server.ws.asr_api import router as asr_router
+from paddlespeech.server.ws.tts_api import router as tts_router
 
 _router = APIRouter()
 
diff --git a/paddlespeech/server/ws/asr_socket.py b/paddlespeech/server/ws/asr_api.py
similarity index 100%
rename from paddlespeech/server/ws/asr_socket.py
rename to paddlespeech/server/ws/asr_api.py
diff --git a/paddlespeech/server/ws/tts_socket.py b/paddlespeech/server/ws/tts_api.py
similarity index 99%
rename from paddlespeech/server/ws/tts_socket.py
rename to paddlespeech/server/ws/tts_api.py
index 482aeb79b0dc36aa028f3fa9be44205926dcd8a9..20a63d4c7eff43a5e3b9a6822c5b928ef03aff50 100644
--- a/paddlespeech/server/ws/tts_socket.py
+++ b/paddlespeech/server/ws/tts_api.py
@@ -58,4 +58,4 @@ async def websocket_endpoint(websocket: WebSocket):
                 break
 
     except WebSocketDisconnect:
-        pass
+        pass
\ No newline at end of file