diff --git a/examples/csmsc/tts0/README.md b/examples/csmsc/tts0/README.md
index ce682495e..8fef32845 100644
--- a/examples/csmsc/tts0/README.md
+++ b/examples/csmsc/tts0/README.md
@@ -99,56 +99,9 @@ pwg_baker_ckpt_0.4
 ```
 `./local/synthesize.sh` calls `${BIN_DIR}/../synthesize.py`, which can synthesize waveform from `metadata.jsonl`.
 ```bash
-CUDA_VISIBLE_DEVICES=${gpus} ./local/synthesize.sh ${conf_path} ${train_output_path} ${ckpt_name}
-```
-```text
-usage: synthesize.py [-h]
-                     [--am {speedyspeech_csmsc,fastspeech2_csmsc,fastspeech2_ljspeech,fastspeech2_aishell3,fastspeech2_vctk,tacotron2_csmsc,tacotron2_ljspeech,tacotron2_aishell3}]
-                     [--am_config AM_CONFIG] [--am_ckpt AM_CKPT]
-                     [--am_stat AM_STAT] [--phones_dict PHONES_DICT]
-                     [--tones_dict TONES_DICT] [--speaker_dict SPEAKER_DICT]
-                     [--voice-cloning VOICE_CLONING]
-                     [--voc {pwgan_csmsc,pwgan_ljspeech,pwgan_aishell3,pwgan_vctk,mb_melgan_csmsc,wavernn_csmsc,hifigan_csmsc,hifigan_ljspeech,hifigan_aishell3,hifigan_vctk,style_melgan_csmsc}]
-                     [--voc_config VOC_CONFIG] [--voc_ckpt VOC_CKPT]
-                     [--voc_stat VOC_STAT] [--ngpu NGPU]
-                     [--test_metadata TEST_METADATA] [--output_dir OUTPUT_DIR]
-
-Synthesize with acoustic model & vocoder
-
-optional arguments:
-  -h, --help            show this help message and exit
-  --am {speedyspeech_csmsc,fastspeech2_csmsc,fastspeech2_ljspeech,fastspeech2_aishell3,fastspeech2_vctk,tacotron2_csmsc,tacotron2_ljspeech,tacotron2_aishell3}
-                        Choose acoustic model type of tts task.
-  --am_config AM_CONFIG
-                        Config of acoustic model.
-  --am_ckpt AM_CKPT     Checkpoint file of acoustic model.
-  --am_stat AM_STAT     mean and standard deviation used to normalize
-                        spectrogram when training acoustic model.
-  --phones_dict PHONES_DICT
-                        phone vocabulary file.
-  --tones_dict TONES_DICT
-                        tone vocabulary file.
-  --speaker_dict SPEAKER_DICT
-                        speaker id map file.
-  --voice-cloning VOICE_CLONING
-                        whether training voice cloning model.
-  --voc {pwgan_csmsc,pwgan_ljspeech,pwgan_aishell3,pwgan_vctk,mb_melgan_csmsc,wavernn_csmsc,hifigan_csmsc,hifigan_ljspeech,hifigan_aishell3,hifigan_vctk,style_melgan_csmsc}
-                        Choose vocoder type of tts task.
-  --voc_config VOC_CONFIG
-                        Config of voc.
-  --voc_ckpt VOC_CKPT   Checkpoint file of voc.
-  --voc_stat VOC_STAT   mean and standard deviation used to normalize
-                        spectrogram when training voc.
-  --ngpu NGPU           if ngpu == 0, use cpu.
-  --test_metadata TEST_METADATA
-                        test metadata.
-  --output_dir OUTPUT_DIR
-                        output dir.
-```
-`./local/synthesize_e2e.sh` calls `${BIN_DIR}/../synthesize_e2e.py`, which can synthesize waveform from text file.
-```bash
-CUDA_VISIBLE_DEVICES=${gpus} ./local/synthesize_e2e.sh ${conf_path} ${train_output_path} ${ckpt_name}
+CUDA_VISIBLE_DEVICES=${gpus} ./local/synthesize_e2e.sh --stage 0 ${conf_path} ${train_output_path} ${ckpt_name}
 ```
+`--stage` controls the vocoder model during synthesis, which can be `0` or `1`, use `pwgan` or `hifigan` model as vocoder.
 ```text
 usage: synthesize_e2e.py [-h]
                          [--am {speedyspeech_csmsc,speedyspeech_aishell3,fastspeech2_csmsc,fastspeech2_ljspeech,fastspeech2_aishell3,fastspeech2_vctk,tacotron2_csmsc,tacotron2_ljspeech}]
diff --git a/examples/csmsc/tts0/run.sh b/examples/csmsc/tts0/run.sh
index 8f06e933c..e4aac3d7d 100755
--- a/examples/csmsc/tts0/run.sh
+++ b/examples/csmsc/tts0/run.sh
@@ -27,13 +27,15 @@ if [ ${stage} -le 1 ] && [ ${stop_stage} -ge 1 ]; then
 fi
 
 if [ ${stage} -le 2 ] && [ ${stop_stage} -ge 2 ]; then
-    # synthesize, vocoder is pwgan
-    CUDA_VISIBLE_DEVICES=${gpus} ./local/synthesize.sh ${conf_path} ${train_output_path} ${ckpt_name} || exit -1
+    # synthesize, vocoder is pwgan by default stage 0, stage 1 will use hifigan as vocoder
+    CUDA_VISIBLE_DEVICES=${gpus} ./local/synthesize.sh --stage 0
+    ${conf_path} ${train_output_path} ${ckpt_name} || exit -1
 fi
 
 if [ ${stage} -le 3 ] && [ ${stop_stage} -ge 3 ]; then
-    # synthesize_e2e, vocoder is pwgan
-    CUDA_VISIBLE_DEVICES=${gpus} ./local/synthesize_e2e.sh ${conf_path} ${train_output_path} ${ckpt_name} || exit -1
+    # synthesize_e2e, vocoder is pwgan by default stage 0, stage 1 will use hifigan as vocoder
+    CUDA_VISIBLE_DEVICES=${gpus} ./local/synthesize_e2e.sh --stage 0
+    ${conf_path} ${train_output_path} ${ckpt_name} || exit -1
 fi
 
 if [ ${stage} -le 4 ] && [ ${stop_stage} -ge 4 ]; then