diff --git a/python/paddle/fluid/tests/unittests/test_listen_and_serv_op.py b/python/paddle/fluid/tests/unittests/test_listen_and_serv_op.py
index d1d709551c77908db88be6fda7ac74d4e922138e..86f18731fe8321fcceb24b0d8b602df8be457760 100644
--- a/python/paddle/fluid/tests/unittests/test_listen_and_serv_op.py
+++ b/python/paddle/fluid/tests/unittests/test_listen_and_serv_op.py
@@ -92,6 +92,7 @@ class TestListenAndServOp(OpTest):
         pid = self._start_pserver(False, True)
         self._wait_ps_ready(pid)
 
+        print("send kill signal, ", pid)
         # raise SIGTERM to pserver
         os.kill(pid, signal.SIGTERM)
 
@@ -99,6 +100,7 @@ class TestListenAndServOp(OpTest):
         pid = self._start_pserver(False, False)
         self._wait_ps_ready(pid)
 
+        print("send kill signal, ", pid)
         # raise SIGTERM to pserver
         os.kill(pid, signal.SIGTERM)