diff --git a/python/paddle/fluid/tests/unittests/test_conv3d_op.py b/python/paddle/fluid/tests/unittests/test_conv3d_op.py
index 216d3ad2d0e47cd9df5d42985c9781bd30b9aae0..c6b749fe09b18b1d704f45a5a5b3adbd5c6a6d0b 100644
--- a/python/paddle/fluid/tests/unittests/test_conv3d_op.py
+++ b/python/paddle/fluid/tests/unittests/test_conv3d_op.py
@@ -112,59 +112,35 @@ class TestConv3dOp(OpTest):
         return core.is_compiled_with_cuda() and self.use_cudnn
 
     def test_check_output(self):
-        if self.testcudnn():
-            place = core.CUDAPlace(0)
-            self.check_output_with_place(place, atol=1e-5)
-        else:
-            self.check_output()
+        place = core.CUDAPlace(0) if self.testcudnn() else core.CPUPlace()
+        self.check_output_with_place(place, atol=1e-5)
 
     def test_check_grad(self):
         if self.dtype == np.float16:
             return
-        if self.testcudnn():
-            place = core.CUDAPlace(0)
-            self.check_grad_with_place(
-                place,
-                set(['Input', 'Filter']),
-                'Output',
-                max_relative_error=0.03)
-        else:
-            self.check_grad(
-                set(['Input', 'Filter']), 'Output', max_relative_error=0.03)
+        place = core.CUDAPlace(0) if self.testcudnn() else core.CPUPlace()
+        self.check_grad_with_place(
+            place, {'Input', 'Filter'}, 'Output', max_relative_error=0.03)
 
     def test_check_grad_no_filter(self):
         if self.dtype == np.float16:
             return
-        if self.testcudnn():
-            place = core.CUDAPlace(0)
-            self.check_grad_with_place(
-                place, ['Input'],
-                'Output',
-                max_relative_error=0.03,
-                no_grad_set=set(['Filter']))
-        else:
-            self.check_grad(
-                ['Input'],
-                'Output',
-                max_relative_error=0.03,
-                no_grad_set=set(['Filter']))
+        place = core.CUDAPlace(0) if self.testcudnn() else core.CPUPlace()
+        self.check_grad_with_place(
+            place, ['Input'],
+            'Output',
+            max_relative_error=0.03,
+            no_grad_set=set(['Filter']))
 
     def test_check_grad_no_input(self):
         if self.dtype == np.float16:
             return
-        if self.testcudnn():
-            place = core.CUDAPlace(0)
-            self.check_grad_with_place(
-                place, ['Filter'],
-                'Output',
-                max_relative_error=0.03,
-                no_grad_set=set(['Input']))
-        else:
-            self.check_grad(
-                ['Filter'],
-                'Output',
-                max_relative_error=0.03,
-                no_grad_set=set(['Input']))
+        place = core.CUDAPlace(0) if self.testcudnn() else core.CPUPlace()
+        self.check_grad_with_place(
+            place, ['Input'],
+            'Output',
+            max_relative_error=0.03,
+            no_grad_set=set(['Input']))
 
     def init_test_case(self):
         self.pad = [0, 0, 0]