diff --git a/paddlespeech/server/engine/tts/online/onnx/tts_engine.py b/paddlespeech/server/engine/tts/online/onnx/tts_engine.py
index 9dd31a08b..52e721cdc 100644
--- a/paddlespeech/server/engine/tts/online/onnx/tts_engine.py
+++ b/paddlespeech/server/engine/tts/online/onnx/tts_engine.py
@@ -466,7 +466,7 @@ class PaddleTTSConnectionHandler:
             wav_base64 = base64.b64encode(wav_bytes).decode('utf8')  # to base64
             wav_list.append(wav)
 
-            yield wav_base64
+            yield wav_base64 + '\r\n'
 
         wav_all = np.concatenate(wav_list, axis=0)
         duration = len(wav_all) / self.tts_engine.sample_rate