diff --git a/python/paddle/fluid/tests/unittests/test_imperative_optimizer.py b/python/paddle/fluid/tests/unittests/test_imperative_optimizer.py
index f509ff4a2336a9fda8263327ff623ceefd9deea4..ef34b998d1455c92850df77c7fd4d85b8a4fddaf 100644
--- a/python/paddle/fluid/tests/unittests/test_imperative_optimizer.py
+++ b/python/paddle/fluid/tests/unittests/test_imperative_optimizer.py
@@ -146,7 +146,7 @@ class TestImperativeOptimizerBase(unittest.TestCase):
         self.assertTrue(np.allclose(static_out, dy_out))
 
         for key, value in six.iteritems(static_param_value):
-            self.assertTrue(np.allclose(value, dy_param_value[key], atol=1e-5))
+            self.assertTrue(np.allclose(value, dy_param_value[key]))
 
 
 class TestImperativeOptimizerPiecewiseDecay(TestImperativeOptimizerBase):