diff --git a/paddlespeech/t2s/modules/diffnet.py b/paddlespeech/t2s/modules/diffnet.py
index 25339daea..2f433ad68 100644
--- a/paddlespeech/t2s/modules/diffnet.py
+++ b/paddlespeech/t2s/modules/diffnet.py
@@ -17,7 +17,6 @@ import paddle
 import paddle.nn.functional as F
 from paddle import nn
 
-from paddlespeech.t2s.modules.nets_utils import initialize
 from paddlespeech.utils.initialize import _calculate_fan_in_and_fan_out
 from paddlespeech.utils.initialize import kaiming_normal_
 from paddlespeech.utils.initialize import kaiming_uniform_
diff --git a/paddlespeech/t2s/modules/diffusion.py b/paddlespeech/t2s/modules/diffusion.py
index 3222a8032..adbd9ce7f 100644
--- a/paddlespeech/t2s/modules/diffusion.py
+++ b/paddlespeech/t2s/modules/diffusion.py
@@ -12,7 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 """Diffusion denoising related modules for paddle"""
-import math
 from typing import Callable
 from typing import Optional
 from typing import Tuple
@@ -21,12 +20,8 @@ import numpy as np
 import paddle
 import ppdiffusers
 from paddle import nn
-from ppdiffusers.models.embeddings import Timesteps
 from ppdiffusers.schedulers import DDPMScheduler
 
-from paddlespeech.t2s.modules.nets_utils import initialize
-from paddlespeech.t2s.modules.residual_block import WaveNetResidualBlock
-
 
 class GaussianDiffusion(nn.Layer):
     """Common Gaussian Diffusion Denoising Model Module 
diff --git a/paddlespeech/t2s/modules/wavenet_denoiser.py b/paddlespeech/t2s/modules/wavenet_denoiser.py
index f84a0893d..61c922652 100644
--- a/paddlespeech/t2s/modules/wavenet_denoiser.py
+++ b/paddlespeech/t2s/modules/wavenet_denoiser.py
@@ -12,16 +12,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 import math
-from typing import Callable
-from typing import Optional
-from typing import Tuple
 
-import numpy as np
 import paddle
-import ppdiffusers
 from paddle import nn
 from ppdiffusers.models.embeddings import Timesteps
-from ppdiffusers.schedulers import DDPMScheduler
 
 from paddlespeech.t2s.modules.nets_utils import initialize
 from paddlespeech.t2s.modules.residual_block import WaveNetResidualBlock