diff --git a/python/paddle/v2/fluid/layers/nn.py b/python/paddle/v2/fluid/layers/nn.py
index 57813af9399be427eeae0c572d575e6d8a3d6aa0..b8224f5604cbbce74463134f0e77cf621b1c09f1 100644
--- a/python/paddle/v2/fluid/layers/nn.py
+++ b/python/paddle/v2/fluid/layers/nn.py
@@ -1253,9 +1253,9 @@ def conv2d(input,
             raise ValueError("num_channels must be divisible by groups.")
         num_filter_channels = num_channels / groups
 
-    filter_size = utils.convert_to_list(filter_size, 2, 'conv2d.filter_size')
-    stride = utils.convert_to_list(stride, 2, 'conv2d.stride')
-    padding = utils.convert_to_list(padding, 2, 'conv2d.padding')
+    filter_size = utils.convert_to_list(filter_size, 2, 'filter_size')
+    stride = utils.convert_to_list(stride, 2, 'stride')
+    padding = utils.convert_to_list(padding, 2, 'padding')
 
     if not isinstance(use_cudnn, bool):
         raise ValueError("use_cudnn should be True or False")
@@ -1433,8 +1433,8 @@ def sequence_last_step(input):
 def pool2d(input,
            pool_size,
            pool_type,
-           pool_stride=None,
-           pool_padding=None,
+           pool_stride=1,
+           pool_padding=0,
            global_pooling=False,
            use_cudnn=True,
            name=None):
@@ -1442,20 +1442,15 @@ def pool2d(input,
     This function adds the operator for pooling in 2 dimensions, using the
     pooling configurations mentioned in input parameters.
     """
-    if pool_padding is None:
-        pool_padding = [0, 0]
-    if pool_stride is None:
-        pool_stride = [1, 1]
     if pool_type not in ["max", "avg"]:
         raise ValueError(
             "Unknown pool_type: '%s'. It can only be 'max' or 'avg'.",
             str(pool_type))
-    if isinstance(pool_size, int):
-        pool_size = [pool_size, pool_size]
-    if isinstance(pool_stride, int):
-        pool_stride = [pool_stride, pool_stride]
-    if isinstance(pool_padding, int):
-        pool_padding = [pool_padding, pool_padding]
+
+    pool_size = utils.convert_to_list(pool_size, 2, 'pool_size')
+    pool_padding = utils.convert_to_list(pool_padding, 2, 'pool_padding')
+    pool_stride = utils.convert_to_list(pool_stride, 2, 'pool_stride')
+
     if not isinstance(use_cudnn, bool):
         raise ValueError("use_cudnn should be True or False")
 
@@ -1782,9 +1777,9 @@ def conv2d_transpose(input,
         raise TypeError("Input of conv2d_transpose must be Variable")
     input_channel = input.shape[1]
 
-    padding = utils.convert_to_list(padding, 2, 'conv2d_transpose.padding')
-    stride = utils.convert_to_list(stride, 2, 'conv2d_transpose.stride')
-    dilation = utils.convert_to_list(dilation, 2, 'conv2d_transpose.dilation')
+    padding = utils.convert_to_list(padding, 2, 'padding')
+    stride = utils.convert_to_list(stride, 2, 'stride')
+    dilation = utils.convert_to_list(dilation, 2, 'dilation')
 
     if not isinstance(use_cudnn, bool):
         raise ValueError("use_cudnn should be True or False")