diff --git a/examples/aishell/asr0/conf/deepspeech2.yaml b/examples/aishell/asr0/conf/deepspeech2.yaml
index 1dc8581e08638875a7eeeb043a42763a6ff83197..ec9e02b66d45cd54e582dae6c615421169b41fbf 100644
--- a/examples/aishell/asr0/conf/deepspeech2.yaml
+++ b/examples/aishell/asr0/conf/deepspeech2.yaml
@@ -23,7 +23,7 @@ augmentation_config: conf/augmentation.json
 random_seed: 0
 spm_model_prefix: 
 spectrum_type: linear
-feat_dim: 
+feat_dim: 161
 delta_delta: False
 stride_ms: 10.0
 window_ms: 20.0
diff --git a/examples/aishell/asr0/conf/deepspeech2_online.yaml b/examples/aishell/asr0/conf/deepspeech2_online.yaml
index c49973a264e283c2a6985caac10e48573eebca3f..05594e2d7b9bed3c4cb641072a2674e9adfa0421 100644
--- a/examples/aishell/asr0/conf/deepspeech2_online.yaml
+++ b/examples/aishell/asr0/conf/deepspeech2_online.yaml
@@ -23,7 +23,7 @@ augmentation_config: conf/augmentation.json
 random_seed: 0
 spm_model_prefix: 
 spectrum_type: linear #linear, mfcc, fbank
-feat_dim: 
+feat_dim: 161
 delta_delta: False
 stride_ms: 10.0
 window_ms: 20.0
diff --git a/examples/tiny/asr0/conf/deepspeech2.yaml b/examples/tiny/asr0/conf/deepspeech2.yaml
index a16a79d3ae86f9af8d06f652770b57e46b3e8dce..2cc4483eb9b1be89449005ed7a80f04c1f0b1128 100644
--- a/examples/tiny/asr0/conf/deepspeech2.yaml
+++ b/examples/tiny/asr0/conf/deepspeech2.yaml
@@ -23,7 +23,7 @@ augmentation_config: conf/augmentation.json
 random_seed: 0
 spm_model_prefix: 
 spectrum_type: linear
-feat_dim: 
+feat_dim: 161
 delta_delta: False
 stride_ms: 10.0
 window_ms: 20.0
diff --git a/examples/tiny/asr0/conf/deepspeech2_online.yaml b/examples/tiny/asr0/conf/deepspeech2_online.yaml
index 5458cfb30c4d1871e684b44da03b52e25689aab9..3bd4f63502e15910fef2c6280e85d087faccbcaf 100644
--- a/examples/tiny/asr0/conf/deepspeech2_online.yaml
+++ b/examples/tiny/asr0/conf/deepspeech2_online.yaml
@@ -23,7 +23,7 @@ augmentation_config: conf/augmentation.json
 random_seed: 0
 spm_model_prefix: 
 spectrum_type: linear
-feat_dim: 
+feat_dim: 161
 delta_delta: False
 stride_ms: 10.0
 window_ms: 20.0