diff --git a/python/paddle/fluid/tests/unittests/test_dist_mnist.py b/python/paddle/fluid/tests/unittests/test_dist_mnist.py
index e4d39c8b3f90848701b1e881f827eb2de3c0b369..450ec414d117f8d3897140875b2f7e7822f27515 100644
--- a/python/paddle/fluid/tests/unittests/test_dist_mnist.py
+++ b/python/paddle/fluid/tests/unittests/test_dist_mnist.py
@@ -145,7 +145,7 @@ class TestDistMnist(unittest.TestCase):
                 retry_times -= 1
 
     def stop_pserver(self, pid):
-        os.kill(pid, signal.SIGTERM)
+        os.kill(pid, signal.SIGKILL)
 
     def test_with_place(self):
         p = fluid.CUDAPlace(0) if core.is_compiled_with_cuda(