diff --git a/python/paddle/v2/framework/tests/test_conv2d_op.py b/python/paddle/v2/framework/tests/test_conv2d_op.py
index c6a1121389bf7010a68d07195c6ae1daf0565c5d..34f8f05c47a8e9f2784eef31d5a7dca42b313dde 100644
--- a/python/paddle/v2/framework/tests/test_conv2d_op.py
+++ b/python/paddle/v2/framework/tests/test_conv2d_op.py
@@ -21,41 +21,37 @@ def conv2d_forward_naive(input, filter, group, conv_param):
     for i in range(out_h):
         for j in range(out_w):
             for g in range(group):
-                input_pad_masked = input_pad[:, g * f_c:(
-                    g + 1) * f_c, i * stride[0]:i * stride[0] + f_h, j * stride[
-                        1]:j * stride[1] + f_w]
+                input_pad_masked = \
+                    input_pad[:, g * f_c:(g + 1) * f_c,
+                    i * stride[0]:i * stride[0] + f_h,
+                    j * stride[1]:j * stride[1] + f_w]
+
                 f_sub = filter[g * sub_out_c:(g + 1) * sub_out_c, :, :, :]
                 for k in range(sub_out_c):
-                    out[:, g * sub_out_c + k, i, j] = np.sum(input_pad_masked *
-                                                             f_sub[k, :, :, :],
-                                                             axis=(1, 2, 3))
+                    out[:, g * sub_out_c + k, i, j] = \
+                        np.sum(input_pad_masked * f_sub[k, :, :, :],
+                               axis=(1, 2, 3))
 
     return out
 
 
 class TestConv2dOp(OpTest):
     def setUp(self):
-        self.init_groups()
-        self.init_optype()
-        pad = [0, 0]
-        stride = [1, 1]
-        input_size = [2, 3, 5, 5]  # NCHW
-        assert np.mod(input_size[1], self.groups) == 0
-        f_c = input_size[1] / self.groups
-        filter_size = [6, f_c, 3, 3]
-
-        conv2d_param = {'stride': stride, 'pad': pad}
-        input = np.random.random(input_size).astype("float32")
-        filter = np.random.random(filter_size).astype("float32")
+        self.init_op_type()
+        self.init_group()
+        self.init_test_case()
 
+        conv2d_param = {'stride': self.stride, 'pad': self.pad}
+        input = np.random.random(self.input_size).astype("float32")
+        filter = np.random.random(self.filter_size).astype("float32")
         output = conv2d_forward_naive(input, filter, self.groups, conv2d_param)
 
         self.inputs = {'Input': input, 'Filter': filter}
         self.attrs = {
-            'strides': stride,
-            'paddings': pad,
+            'strides': self.stride,
+            'paddings': self.pad,
             'groups': self.groups,
-            'dilations': [1, 1]
+            'dilations': self.dilations
         }
         self.outputs = {'Output': output}
 
@@ -80,30 +76,47 @@ class TestConv2dOp(OpTest):
             max_relative_error=0.05,
             no_grad_set=set(['Input']))
 
-    def init_groups(self):
+    def init_test_case(self):
+        self.groups = 1
+        self.op_type = "conv2d"
+        self.pad = [0, 0]
+        self.stride = [1, 1]
+        self.dilations = [1, 1]
+        self.input_size = [2, 3, 5, 5]  # NCHW
+        assert np.mod(self.input_size[1], self.groups) == 0
+        f_c = self.input_size[1] / self.groups
+        self.filter_size = [6, f_c, 3, 3]
+
+    def init_group(self):
         self.groups = 1
 
-    def init_optype(self):
+    def init_op_type(self):
         self.op_type = "conv2d"
 
 
 class TestWithGroup(TestConv2dOp):
-    def init_groups(self):
+    def init_group(self):
         self.groups = 3
 
+    def init_op_type(self):
+        self.op_type = "conv2d"
 
-class TestCudnn2d(TestConv2dOp):
-    def init_optype(self):
-        self.op_type = "conv_cudnn"
 
+class TestCudnn(TestConv2dOp):
+    def init_group(self):
+        self.groups = 1
 
-class TestCudnn2dWithGroup(TestConv2dOp):
-    def init_optype(self):
+    def init_op_type(self):
         self.op_type = "conv_cudnn"
 
-    def init_groups(self):
+
+class TestCudnnWithGroup(TestConv2dOp):
+    def init_group(self):
         self.groups = 3
 
+    def init_op_type(self):
+        self.op_type = "conv_cudnn"
+
 
 if __name__ == '__main__':
     unittest.main()