diff --git a/examples/aishell/asr1/conf/tuning/chunk_decode.yaml b/examples/aishell/asr1/conf/tuning/chunk_decode.yaml
index 72ede9272..7e8afb7a8 100644
--- a/examples/aishell/asr1/conf/tuning/chunk_decode.yaml
+++ b/examples/aishell/asr1/conf/tuning/chunk_decode.yaml
@@ -3,9 +3,9 @@ decode_batch_size: 128
 error_rate_type: cer 
 decoding_method: attention # 'attention', 'ctc_greedy_search', 'ctc_prefix_beam_search', 'attention_rescoring'
 ctc_weight: 0.5 # ctc weight for attention rescoring decode mode.
-decoding_chunk_size: -1 # decoding chunk size. Defaults to -1.
+decoding_chunk_size: 16 # decoding chunk size. Defaults to -1.
     # <0: for decoding, use full chunk.
     # >0: for decoding, use fixed chunk size as set.
     # 0: used for training, it's prohibited here. 
 num_decoding_left_chunks: -1  # number of left chunks for decoding. Defaults to -1.
-simulate_streaming: False  # simulate streaming inference. Defaults to False.
+simulate_streaming: True  # simulate streaming inference. Defaults to False.