diff --git a/paddle/scripts/paddle_build.sh b/paddle/scripts/paddle_build.sh
index f84ea8f9db6aa53d5f8d774a0e00b538a76d15cb..e8d2e8e6861b95c94077a72f8e4f7d11b0ab11be 100755
--- a/paddle/scripts/paddle_build.sh
+++ b/paddle/scripts/paddle_build.sh
@@ -381,7 +381,7 @@ function run_mac_test() {
 EOF
 
         # TODO: jiabin need to refine this part when these tests fixed on mac
-        ctest --output-on-failure -j8     
+        ctest --output-on-failure -j $1     
         # make install should also be test when unittest 
         make install -j 8
         pip install /usr/local/opt/paddle/share/wheels/*.whl