diff --git a/python/paddle/fluid/tests/unittests/test_concat_op.py b/python/paddle/fluid/tests/unittests/test_concat_op.py
index 4b34f596f7916f3233532a920b40a134ec78c28f..13135eb31b8de22529ef1a850519b17c50fe6503 100644
--- a/python/paddle/fluid/tests/unittests/test_concat_op.py
+++ b/python/paddle/fluid/tests/unittests/test_concat_op.py
@@ -296,7 +296,13 @@ def create_test_bf16(parent):
     globals()[cls_name] = TestConcatBf16
 
 
+# add all unit test maybe timeout.
 create_test_bf16(TestConcatOp)
+create_test_bf16(TestConcatOp2)
+# create_test_bf16(TestConcatOp3)
+create_test_bf16(TestConcatOp4)
+# create_test_bf16(TestConcatOp5)
+# create_test_bf16(TestConcatOp6)
 
 
 class TestConcatOpError(unittest.TestCase):