diff --git a/paddle/scripts/paddle_build.sh b/paddle/scripts/paddle_build.sh
index ac569a3c7a58dbd10e699b4083f07bb25396d42b..1315771bdf5290705a57b82e7ecd58f39cae9a5c 100755
--- a/paddle/scripts/paddle_build.sh
+++ b/paddle/scripts/paddle_build.sh
@@ -506,6 +506,57 @@ function generate_api_spec() {
     deactivate
 }
 
+function check_change_of_unittest() {
+    fetch_upstream_develop_if_not_exist
+    cur_branch=`git branch | grep \* | cut -d ' ' -f2` 
+    git checkout -b develop_base_pr upstream/$BRANCH
+    cmake_gen $1
+    generate_unittest_spec "DEV"
+    git checkout $cur_branch
+    git branch -D develop_base_pr
+    rm -rf ${PADDLE_ROOT}/build
+    cmake_gen $1
+    generate_unittest_spec "PR"
+
+    # approval_user_list: XiaoguangHu01 46782768,luotao1 6836917,phlrain 43953930,lanxianghit 47554610, zhouwei25 52485244
+    approval_line=`curl -H "Authorization: token ${GITHUB_API_TOKEN}" https://api.github.com/repos/PaddlePaddle/Paddle/pulls/${GIT_PR_ID}/reviews?per_page=10000`
+    tests_spec_diff=`python ${PADDLE_ROOT}/tools/diff_unittest.py ${PADDLE_ROOT}/paddle/fluid/UNITTEST_DEV.spec  ${PADDLE_ROOT}/paddle/fluid/UNITTEST_PR.spec`
+    if [ "$test_spec_diff" != "" ]; then
+        APPROVALS=`echo ${approval_line}|python ${PADDLE_ROOT}/tools/check_pr_approval.py 1 46782768 6836917 43953930 47554610`
+        echo "current pr ${GIT_PR_ID} got approvals: ${APPROVALS}"
+        if [ "${APPROVALS}" == "FALSE" ]; then
+            echo "****************"
+            echo -e "You must have one RD (luotao1 or XiaoguangHu01 or phlrain or lanxianghit or zhouwei25) approval for the deletion of unit tests.\n"
+            echo "There are one approved errors."
+            echo "****************"
+            exit 1
+        fi
+    fi
+    ENABLE_MAKE_CLEAN="OFF"
+}
+
+function generate_unittest_spec() {
+    spec_kind=$1
+    if [ "$spec_kind" == "DEV" ]; then
+        cat <<EOF
+        ============================================================
+        Complete cmake first time to get number of unit tests in develop.
+        ============================================================
+EOF
+    elif [ "$spec_kind" == "PR" ]; then
+        cat <<EOF
+        ============================================================
+        Complete cmake second time to get number of unit tests in this PR.
+        ============================================================
+EOF
+    else
+        echo "Not supported $1"
+        exit 1
+    fi
+    spec_path=${PADDLE_ROOT}/paddle/fluid/UNITTEST_${spec_kind}.spec 
+    ctest -N | awk -F ':' '{print $2}' | sed '/^$/d' | sed '$d' > ${spec_path}
+}
+
 
 function assert_api_spec_approvals() {
     /bin/bash ${PADDLE_ROOT}/tools/check_api_approvals.sh
@@ -1111,6 +1162,11 @@ function main() {
         build_mac
         run_mac_test ${PYTHON_ABI:-""} ${PROC_RUN:-1}
         ;;
+      maccheck_py35)
+        check_change_of_unittest ${PYTHON_ABI:-""}
+        build_mac
+        run_mac_test ${PYTHON_ABI:-""} ${PROC_RUN:-1}
+        ;;
       macbuild)
         cmake_gen ${PYTHON_ABI:-""}
         build_mac
diff --git a/tools/check_api_approvals.sh b/tools/check_api_approvals.sh
index 8c7518ed517315096b96358a527f130428d6d81c..e7fdca27a8d6ed4cc74dcac8e622389a5c04a5c3 100644
--- a/tools/check_api_approvals.sh
+++ b/tools/check_api_approvals.sh
@@ -78,7 +78,7 @@ for API_FILE in ${API_FILES[*]}; do
   echo "checking ${API_FILE} change, PR: ${GIT_PR_ID}, changes: ${API_CHANGE}"
   if [ "${API_CHANGE}" ] && [ "${GIT_PR_ID}" != "" ]; then
       # NOTE: per_page=10000 should be ok for all cases, a PR review > 10000 is not human readable.q
-      # approval_user_list: XiaoguangHu01 46782768,Xreki 12538138,luotao1 6836917,sneaxiy 32832641,qingqing01 7845005,guoshengCS 14105589,heavengate 12605721,kuke 3064195,Superjomn 328693,lanxianghit 47554610,cyj1986 39645414,hutuxian 11195205,frankwhzhang 20274488,nepeplwu 45024560,Dianhai 38231817,JiabinYang 22361972,chenwhql 22561442,zhiqiu 6888866,seiriosPlus 5442383,gongweibao 10721757,saxon-zh 2870059,Boyan-Liu 2870059, Aurelius84 9301846, liym27 33742067, zhhsplendid 7913861.
+      # approval_user_list: XiaoguangHu01 46782768,Xreki 12538138,luotao1 6836917,sneaxiy 32832641,qingqing01 7845005,guoshengCS 14105589,heavengate 12605721,kuke 3064195,Superjomn 328693,lanxianghit 47554610,cyj1986 39645414,hutuxian 11195205,frankwhzhang 20274488,nepeplwu 45024560,Dianhai 38231817,JiabinYang 22361972,chenwhql 22561442,zhiqiu 6888866,seiriosPlus 5442383,gongweibao 10721757,saxon-zh 2870059,Boyan-Liu 2870059, zhouwei25 52485244, Aurelius84 9301846, liym27 33742067, zhhsplendid 7913861.
       if [ "${API_FILE}" == "paddle/fluid/op_use_default_grad_op_maker.spec" ];then
           echo_line="You must have one RD (sneaxiy (Recommend) or luotao1) approval for op_use_default_grad_op_maker.spec, which manages the grad_op memory optimization.\n"
           check_approval 1 32832641 6836917
diff --git a/tools/diff_unittest.py b/tools/diff_unittest.py
new file mode 100644
index 0000000000000000000000000000000000000000..863e2beabfe4bd2e4d57fa1a7b49b050f05dc668
--- /dev/null
+++ b/tools/diff_unittest.py
@@ -0,0 +1,31 @@
+#!/usr/bin/env python
+import difflib
+import sys
+
+with open(sys.argv[1], 'r') as f:
+    origin = f.read()
+    origin = origin.splitlines()
+
+with open(sys.argv[2], 'r') as f:
+    new = f.read()
+    new = new.splitlines()
+
+differ = difflib.Differ()
+result = differ.compare(origin, new)
+
+error = False
+diffs = []
+for each_diff in result:
+    if each_diff[0] == '-':  # delete unit test is not allowed
+        error = True
+        diffs.append(each_diff)
+'''
+If you delete the unit test, such as commenting it out, 
+please ask for approval of one RD below for passing CI:
+
+    - XiaoguangHu01 or luotao1 or phlrain or lanxianghit or zhouwei25
+'''
+if error:
+    print('Deleted Unit test is: ')
+    for each_diff in diffs:
+        print(each_diff)