diff --git a/paddlespeech/s2t/modules/ctc.py b/paddlespeech/s2t/modules/ctc.py
index bd1219b1a34755a9d777eb3bafe623a791baaf13..1bb158738cd43f8983a21734e9a4fc0a2d084de7 100644
--- a/paddlespeech/s2t/modules/ctc.py
+++ b/paddlespeech/s2t/modules/ctc.py
@@ -181,7 +181,6 @@ class CTCDecoder(CTCDecoderBase):
         if self._ext_scorer is not None:
             return
         
-        from paddlespeech.s2t.decoders.ctcdecoder import Scorer  # noqa: F401
         if language_model_path != '':
             logger.info("begin to initialize the external scorer "
                         "for decoding")
diff --git a/paddlespeech/server/conf/ws_application.yaml b/paddlespeech/server/conf/ws_application.yaml
index dae4a3ff26b51a3487fe859735bb7d18bf3c57cb..dee8d78baa933f4447ea1a5afffc157fd70bfa7c 100644
--- a/paddlespeech/server/conf/ws_application.yaml
+++ b/paddlespeech/server/conf/ws_application.yaml
@@ -45,11 +45,3 @@ asr_online:
         shift_n: 4      # frame
         window_ms: 20   # ms
         shift_ms: 10    # ms
-
-    vad_conf:
-        aggressiveness: 2
-        sample_rate: 16000
-        frame_duration_ms: 20
-        sample_width: 2
-        padding_ms: 200
-        padding_ratio: 0.9
\ No newline at end of file
diff --git a/paddlespeech/server/conf/ws_conformer_application.yaml b/paddlespeech/server/conf/ws_conformer_application.yaml
index 89a861eff016718b5c28adeebaec7aca9bbf7ade..e14833dea9ced3f413ff734ea68727e125c9cbe9 100644
--- a/paddlespeech/server/conf/ws_conformer_application.yaml
+++ b/paddlespeech/server/conf/ws_conformer_application.yaml
@@ -21,7 +21,7 @@ engine_list: ['asr_online']
 ################################### ASR #########################################
 ################### speech task: asr; engine_type: online #######################
 asr_online:
-    model_type: 'conformer_online_multi-cn'
+    model_type: 'conformer_online_multicn'
     am_model: # the pdmodel file of am static model [optional]
     am_params:  # the pdiparams file of am static model [optional]
     lang: 'zh'
diff --git a/paddlespeech/server/engine/asr/online/asr_engine.py b/paddlespeech/server/engine/asr/online/asr_engine.py
index c79abf1b93c870b46a4fb455d6cc83d823a31ee9..34a028a332c9ff1efbb55ed700e9c20391e1e563 100644
--- a/paddlespeech/server/engine/asr/online/asr_engine.py
+++ b/paddlespeech/server/engine/asr/online/asr_engine.py
@@ -59,7 +59,7 @@ pretrained_models = {
         'lm_md5':
         '29e02312deb2e59b3c8686c7966d4fe3'
     },
-    "conformer_online_multi-cn-zh-16k": {
+    "conformer_online_multicn-zh-16k": {
         'url':
         'https://paddlespeech.bj.bcebos.com/s2t/multi_cn/asr1/asr1_chunk_conformer_multi_cn_ckpt_0.2.3.model.tar.gz',
         'md5':
diff --git a/paddlespeech/server/ws/asr_socket.py b/paddlespeech/server/ws/asr_socket.py
index 82b05bc551bdbf791be3fc4abaac9e2f885e9dbe..a865703dd338eaecfd66902d18fe2a4d58c857d4 100644
--- a/paddlespeech/server/ws/asr_socket.py
+++ b/paddlespeech/server/ws/asr_socket.py
@@ -28,7 +28,6 @@ router = APIRouter()
 
 @router.websocket('/ws/asr')
 async def websocket_endpoint(websocket: WebSocket):
-    print("websocket protocal receive the dataset")
     await websocket.accept()
 
     engine_pool = get_engine_pool()