diff --git a/python/paddle/fluid/tests/unittests/test_dropout_op.py b/python/paddle/fluid/tests/unittests/test_dropout_op.py
index 2939895d79be8988cd97d61ae53f73ac3ed8a2fe..eaa3435a86462236a99489749abe877648677053 100644
--- a/python/paddle/fluid/tests/unittests/test_dropout_op.py
+++ b/python/paddle/fluid/tests/unittests/test_dropout_op.py
@@ -83,36 +83,36 @@ class TestDropoutOp5(OpTest):
         self.check_output()
 
 
-class TestFP16DropoutOp1(OpTest):
+class TestFP16DropoutOp(OpTest):
     def setUp(self):
-        x = np.random.random((32, 64)).astype("float16")
-        prob = 0.35
-        out = x * (1.0 - prob)
-
         self.op_type = "dropout"
+        self.init_test_case()
+
+        x = np.random.random(self.input_size).astype("float16")
+        out = x * (1.0 - self.prob)
         self.inputs = {'X': OpTest.np_dtype_to_fluid_dtype(x)}
-        self.attrs = {'dropout_prob': prob, 'fix_seed': True, 'is_test': True}
+        self.attrs = {
+            'dropout_prob': self.prob,
+            'fix_seed': self.fix_seed,
+            'is_test': True
+        }
         self.outputs = {'Out': out}
 
+    def init_test_case(self):
+        self.input_size = [32, 64]
+        self.prob = 0.35
+        self.fix_seed = True
+
     def test_check_output(self):
         if core.is_compiled_with_cuda() and core.op_support_gpu("dropout"):
             self.check_output_with_place(core.CUDAPlace(0), atol=1e-3)
 
 
-class TestFP16DropoutOp2(OpTest):
-    def setUp(self):
-        x = np.random.random((32, 64, 3)).astype("float16")
-        prob = 0.75
-        out = x * (1.0 - prob)
-
-        self.op_type = "dropout"
-        self.inputs = {'X': OpTest.np_dtype_to_fluid_dtype(x)}
-        self.attrs = {'dropout_prob': prob, 'is_test': True}
-        self.outputs = {'Out': out}
-
-    def test_check_output(self):
-        if core.is_compiled_with_cuda() and core.op_support_gpu("dropout"):
-            self.check_output_with_place(core.CUDAPlace(0), atol=1e-3)
+class TestFP16DropoutOp2(TestFP16DropoutOp):
+    def init_test_case(self):
+        self.input_size = [32, 64, 3]
+        self.prob = 0.75
+        self.fix_seed = False
 
 
 if __name__ == '__main__':