diff --git a/python/paddle/fluid/tests/unittests/test_batch_norm_op.py b/python/paddle/fluid/tests/unittests/test_batch_norm_op.py
index 5e3c41441dbb12078cbd203c05ed35dd0ee8e49a..851dfe39e48ea16699b3baa5ad39cc33c32dfb03 100644
--- a/python/paddle/fluid/tests/unittests/test_batch_norm_op.py
+++ b/python/paddle/fluid/tests/unittests/test_batch_norm_op.py
@@ -575,7 +575,7 @@ class TestBatchNormOpFreezeStatsAndScaleBiasTraining(
         self.fetch_list = ['y', 'mean', 'variance', 'x@GRAD']
 
 
-class TestBatchNormOpError(OpTest):
+class TestBatchNormOpError(unittest.TestCase):
     def test_errors(self):
         with program_guard(Program(), Program()):
             # the input of batch_norm must be Variable.
diff --git a/python/paddle/fluid/tests/unittests/test_expand_as_op.py b/python/paddle/fluid/tests/unittests/test_expand_as_op.py
index 836e49c54e2dac344761c1717dfad7724a23f3dd..c5d09ac3cd19a89e5c7c4d0a56efd308549648b4 100755
--- a/python/paddle/fluid/tests/unittests/test_expand_as_op.py
+++ b/python/paddle/fluid/tests/unittests/test_expand_as_op.py
@@ -103,7 +103,7 @@ class TestExpandAsOpRank4(OpTest):
 
 
 # Test python API
-class TestExpandAPI(OpTest):
+class TestExpandAPI(unittest.TestCase):
     def test_api(self):
         input1 = np.random.random([12, 14]).astype("float32")
         input2 = np.random.random([48, 14]).astype("float32")
diff --git a/python/paddle/fluid/tests/unittests/test_gather_nd_op.py b/python/paddle/fluid/tests/unittests/test_gather_nd_op.py
index 357b2dc060742e545ce896b60373fe39badf4e3d..724b8040354d5f713d163b699e2884161bce48b9 100644
--- a/python/paddle/fluid/tests/unittests/test_gather_nd_op.py
+++ b/python/paddle/fluid/tests/unittests/test_gather_nd_op.py
@@ -128,7 +128,7 @@ class TestGatherNdOpWithHighRankDiff(OpTest):
 
 
 #Test Python API
-class TestGatherNdOpAPI(OpTest):
+class TestGatherNdOpAPI(unittest.TestCase):
     def test_case1(self):
         x1 = fluid.layers.data(
             name='x1', shape=[30, 40, 50, 60], dtype='float32')
@@ -147,7 +147,7 @@ class TestGatherNdOpAPI(OpTest):
 
 
 #Test Raise Index Error
-class TestGatherNdOpRaise(OpTest):
+class TestGatherNdOpRaise(unittest.TestCase):
     def test_check_raise(self):
         def check_raise_is_test():
             try:
diff --git a/python/paddle/fluid/tests/unittests/test_locality_aware_nms_op.py b/python/paddle/fluid/tests/unittests/test_locality_aware_nms_op.py
index bed185551b77f3e3bc103cc0dbfd4adceb0f78c5..e4845c90a60bf665363195a2766a5cdda9847203 100644
--- a/python/paddle/fluid/tests/unittests/test_locality_aware_nms_op.py
+++ b/python/paddle/fluid/tests/unittests/test_locality_aware_nms_op.py
@@ -307,7 +307,7 @@ class TestLocalAwareNMSOp4Points(OpTest):
         self.check_output()
 
 
-class TestLocalityAwareNMSAPI(OpTest):
+class TestLocalityAwareNMSAPI(unittest.TestCase):
     def test_api(self):
         boxes = fluid.data(name='bboxes', shape=[None, 81, 8], dtype='float32')
         scores = fluid.data(name='scores', shape=[None, 1, 81], dtype='float32')
diff --git a/python/paddle/fluid/tests/unittests/test_lrn_op.py b/python/paddle/fluid/tests/unittests/test_lrn_op.py
index 7ec329d9f6c224e60a8133abb654207ea5c12266..bf6b555c4663781bcad50b282bb6d38969521520 100644
--- a/python/paddle/fluid/tests/unittests/test_lrn_op.py
+++ b/python/paddle/fluid/tests/unittests/test_lrn_op.py
@@ -106,7 +106,7 @@ class TestLRNOpAttrDataFormat(TestLRNOp):
         self.data_format = 'NHWC'
 
 
-class TestLRNAPI(OpTest):
+class TestLRNAPI(unittest.TestCase):
     def test_case(self):
         data1 = fluid.data(name='data1', shape=[2, 4, 5, 5], dtype='float32')
         data2 = fluid.data(name='data2', shape=[2, 5, 5, 4], dtype='float32')
diff --git a/python/paddle/fluid/tests/unittests/test_nearest_interp_op.py b/python/paddle/fluid/tests/unittests/test_nearest_interp_op.py
index a8d16677e22127a484e1c6987d7f6d47fdc220bd..bb90279ea938024e2bc342351782ef932b49193c 100755
--- a/python/paddle/fluid/tests/unittests/test_nearest_interp_op.py
+++ b/python/paddle/fluid/tests/unittests/test_nearest_interp_op.py
@@ -423,7 +423,7 @@ class TestNearestInterp_attr_tensor_Case3(TestNearestInterpOp_attr_tensor):
         self.scale_by_1Dtensor = True
 
 
-class TestNearestAPI(OpTest):
+class TestNearestAPI(unittest.TestCase):
     def test_case(self):
         x = fluid.data(name="x", shape=[2, 3, 6, 6], dtype="float32")
         y = fluid.data(name="y", shape=[2, 6, 6, 3], dtype="float32")
@@ -474,7 +474,7 @@ class TestNearestAPI(OpTest):
             self.assertTrue(np.allclose(results[i + 1], expect_res))
 
 
-class TestNearestInterpException(OpTest):
+class TestNearestInterpException(unittest.TestCase):
     def test_exception(self):
         input = fluid.data(name="input", shape=[1, 3, 6, 6], dtype="float32")
 
diff --git a/python/paddle/fluid/tests/unittests/test_print_op.py b/python/paddle/fluid/tests/unittests/test_print_op.py
index 49b55e376b41811be37c7f149565480a45b556da..21bf3f0b2870c573d5e0ee576a3c829be5c33d71 100644
--- a/python/paddle/fluid/tests/unittests/test_print_op.py
+++ b/python/paddle/fluid/tests/unittests/test_print_op.py
@@ -82,7 +82,7 @@ class TestPrintOpCPU(unittest.TestCase):
                        return_numpy=False)
 
 
-class TestPrintOpError(OpTest):
+class TestPrintOpError(unittest.TestCase):
     def test_errors(self):
         with program_guard(Program(), Program()):
             # The input type of Print_op must be Variable.
diff --git a/python/paddle/fluid/tests/unittests/test_unsqueeze2_op.py b/python/paddle/fluid/tests/unittests/test_unsqueeze2_op.py
index 0e553287b568ecc5477929122bc27ff35f1a2882..51fb7302960f574b4c1d09a8199797a636842666 100644
--- a/python/paddle/fluid/tests/unittests/test_unsqueeze2_op.py
+++ b/python/paddle/fluid/tests/unittests/test_unsqueeze2_op.py
@@ -203,7 +203,7 @@ class TestUnsqueezeOp4_AxesTensor(TestUnsqueezeOp_AxesTensor):
 
 
 # test api
-class TestUnsqueezeAPI(OpTest):
+class TestUnsqueezeAPI(unittest.TestCase):
     def test_api(self):
         input = np.random.random([3, 2, 5]).astype("float32")
         x = fluid.data(name='x', shape=[3, 2, 5], dtype="float32")
diff --git a/python/paddle/fluid/tests/unittests/test_zeros_op.py b/python/paddle/fluid/tests/unittests/test_zeros_op.py
index 1be2f4d04791b76be014e34e1752caab43157fc7..6ce39cd63767e3dac474a7b0b57bfec1438d5e09 100644
--- a/python/paddle/fluid/tests/unittests/test_zeros_op.py
+++ b/python/paddle/fluid/tests/unittests/test_zeros_op.py
@@ -24,7 +24,7 @@ import paddle.fluid as fluid
 from paddle.fluid import compiler, Program, program_guard
 
 
-class TestZerosOpError(OpTest):
+class TestZerosOpError(unittest.TestCase):
     def test_errors(self):
         with program_guard(Program(), Program()):
             # The input dtype of zeros_op must be bool, float16, float32, float64, int32, int64.