diff --git a/python/paddle/v2/fluid/layers/nn.py b/python/paddle/v2/fluid/layers/nn.py
index e8b4cec6ee638b839e2a7c38e032f74b9cd738ef..8623e1f03835fa58502a7154e5f9ee9c535a941d 100644
--- a/python/paddle/v2/fluid/layers/nn.py
+++ b/python/paddle/v2/fluid/layers/nn.py
@@ -1262,7 +1262,7 @@ def conv2d(input,
         raise ValueError("use_cudnn should be True or False")
 
     input_shape = input.shape
-    filter_shape = [num_filters, num_filter_channels] + filter_size
+    filter_shape = [num_filters, num_filter_channels] + list(filter_size)
 
     def _get_default_param_initializer():
         std = (2.0 / (filter_size[0]**2 * num_channels))**0.5
@@ -1826,7 +1826,7 @@ def conv2d_transpose(input,
     elif isinstance(filter_size, int):
         filter_size = [filter_size, filter_size]
 
-    filter_shape = [input_channel, num_filters] + filter_size
+    filter_shape = [input_channel, num_filters] + list(filter_size)
     img_filter = helper.create_parameter(
         dtype=input.dtype, shape=filter_shape, attr=helper.param_attr)