diff --git a/demos/streaming_asr_server/conf/ws_ds2_application.yaml b/demos/streaming_asr_server/conf/ws_ds2_application.yaml
index d19bd26d..5391e5e4 100644
--- a/demos/streaming_asr_server/conf/ws_ds2_application.yaml
+++ b/demos/streaming_asr_server/conf/ws_ds2_application.yaml
@@ -39,11 +39,11 @@ asr_online:
         summary: True  # False -> do not show predictor config
 
     chunk_buffer_conf:
-        frame_duration_ms: 80
+        frame_duration_ms: 85
         shift_ms: 40
         sample_rate: 16000
         sample_width: 2
         window_n: 7     # frame
         shift_n: 4      # frame
-        window_ms: 20   # ms
+        window_ms: 25   # ms
         shift_ms: 10    # ms
diff --git a/paddlespeech/server/conf/ws_application.yaml b/paddlespeech/server/conf/ws_application.yaml
index 43d83f2d..243f549b 100644
--- a/paddlespeech/server/conf/ws_application.yaml
+++ b/paddlespeech/server/conf/ws_application.yaml
@@ -39,11 +39,11 @@ asr_online:
         summary: True  # False -> do not show predictor config
 
     chunk_buffer_conf:
-        frame_duration_ms: 80
+        frame_duration_ms: 85
         shift_ms: 40
         sample_rate: 16000
         sample_width: 2
         window_n: 7     # frame
         shift_n: 4      # frame
-        window_ms: 20   # ms
+        window_ms: 25   # ms
         shift_ms: 10    # ms