diff --git a/lite/tools/build_android.sh b/lite/tools/build_android.sh
index aba5fb706cb62e5bc9b50127f16d07e0db55d595..90f604d97f212e2966326582eefbb8416cc269ad 100755
--- a/lite/tools/build_android.sh
+++ b/lite/tools/build_android.sh
@@ -1,5 +1,5 @@
 #!/bin/bash
-set -x
+set +x
 #####################################################################################################
 # 1. global variables, you can change them according to your requirements
 #####################################################################################################
diff --git a/lite/tools/check_api_approvals.sh b/lite/tools/check_api_approvals.sh
index 6100558d68abb2b4c82c1f367078e519972546ce..2f60a239161848f1aea923520b592122186884c0 100644
--- a/lite/tools/check_api_approvals.sh
+++ b/lite/tools/check_api_approvals.sh
@@ -5,13 +5,14 @@ if [ -z ${BRANCH} ]; then
 fi
 
 LITE_ROOT="$( cd "$( dirname "${BASH_SOURCE[0]}")/../.." && pwd )"
-
 approval_line=`curl -H "Authorization: token ${GITHUB_API_TOKEN}" https://api.github.com/repos/PaddlePaddle/Paddle-Lite/pulls/${GIT_PR_ID}/reviews?per_page=10000`
-git_files=`git diff --numstat upstream/$BRANCH| wc -l`
-git_count=`git diff --numstat upstream/$BRANCH| awk '{sum+=$1}END{print sum}'`
 failed_num=0
 echo_list=()
 
+# approval list
+Superjomn=328693
+DannyIsFunny=45189361
+
 function add_failed(){
     failed_num=`expr $failed_num + 1`
     echo_list="${echo_list[@]}$1"
@@ -24,20 +25,96 @@ function check_approval(){
         add_failed "${failed_num}. ${echo_line}"
     fi
 }
+####################################################################################################
+#  Check 1: You must have Superjomn's (Yunchunwei) approval for changing
+#           20+ files or adding more than 1000+ lines of content
+####################################################################################################
+function CheckModifiedFileNums() {
+    git_files=`git diff --numstat upstream/$BRANCH| wc -l`
+    git_count=`git diff --numstat upstream/$BRANCH| awk '{sum+=$1}END{print sum}'`
 
+    if [[ $git_files -gt 19 || $git_count -gt 999 ]];then
+        echo_line="You must have Superjomn's (Yunchunwei) approval for changing 20+ files or adding more than 1000+ lines of content.\n"
+        check_approval 1 $Superjomn
+    fi
 
-if [[ $git_files -gt 19 || $git_count -gt 999 ]];then
-    echo_line="You must have Superjomn (Yunchunwei) approval for change 20+ files or add than 1000+ lines of content.\n"
-    check_approval 1 328693
-fi 
+    if [ -n "${echo_list}" ];then
+      echo "****************"
+      echo -e "${echo_list[@]}"
+      echo "There are ${failed_num} approved errors."
+      echo "****************"
+    fi
+ 
+    if [ -n "${echo_list}" ]; then
+      exit 1
+    fi
+}
+####################################################################################################
+#  Check 2: You must have Superjomn's (Yunchunwei) approval for increasing 
+#           size of dynamic lib for 10+ kb
+####################################################################################################
+function CheckLibSizeDiff() {
+    # step1: record lib size of current branch
+    lite/tools/build_android.sh --arch=armv8 --toolchain=gcc --android_stl=c++_static --with_log=OFF
+    current_size=`stat -c%s build.lite.android.armv8.gcc/inference_lite_lib.android.armv8/cxx/lib/libpaddle_light_api_shared.so`
 
-if [ -n "${echo_list}" ];then
-  echo "****************"
-  echo -e "${echo_list[@]}"
-  echo "There are ${failed_num} approved errors."
-  echo "****************"
-fi
+    # step2: record lib size of current develop branch
+    git checkout develop
+    git clean -f . && git checkout .
+    git fetch upstream && git merge upstream/develop
+
+    lite/tools/build_android.sh --arch=armv8 --toolchain=gcc --android_stl=c++_static --with_log=OFF
+    develop_size=`stat -c%s build.lite.android.armv8.gcc/inference_lite_lib.android.armv8/cxx/lib/libpaddle_light_api_shared.so`
+
+    # step3: if diff_size > 10485, special approval is needed    
+    diff_size=$[$current_size - $develop_size]
+    if [ $diff_size -gt 10485 ]; then
+        echo_line="Your PR has increased basic inference lib for $diff_size Byte, exceeding maximum requirement of  10485 Byte (0.01M). You need Superjomn's (Yunchunwei) approval or you can contact DannyIsFunny(HuZhiqiang).\n"
+        check_approval 1 $Superjomn $DannyIsFunny
+    fi
+
+    if [ -n "${echo_list}" ];then
+      echo "****************"
+      echo -e "${echo_list[@]}"
+      echo "There are ${failed_num} approved errors."
+      echo "****************"
+    fi
+ 
+    if [ -n "${echo_list}" ]; then
+      exit 1
+    fi
+}
+
+####################################################################################################
+# Main functions
+####################################################################################################
+function main {
+    if [ -z "$1" ]; then
+        # at least on argument is needed
+        echo "Error: at least on argument is needed!"
+        exit 1
+    fi
+
+    # Parse command line.
+    for i in "$@"; do
+        case $i in
+            check_modified_file_nums)
+            # modified files num can not exceed 20 +
+                CheckModifiedFileNums
+                exit 0
+                ;;
+            check_lib_size_diff)
+            # size diff can not exceed 10K +
+                CheckLibSizeDiff
+                exit 0
+                ;;
+            *)
+                # unknown option
+                echo "Error: unsupported input argument!"
+                exit 1
+                ;;
+        esac
+    done
+}
 
-if [ -n "${echo_list}" ]; then
-  exit 1
-fi   
+main $@
diff --git a/lite/tools/ci_build.sh b/lite/tools/ci_build.sh
index c61ecbf2a884ee2c340913223b664c274e53f64f..680c865c2c8999a29ff2b351dadfc797506c87f6 100755
--- a/lite/tools/ci_build.sh
+++ b/lite/tools/ci_build.sh
@@ -279,7 +279,7 @@ function test_server {
 }
 
 function assert_api_spec_approvals() {
-    /bin/bash ${LITE_ROOT}/lite/tools/check_api_approvals.sh
+    /bin/bash ${LITE_ROOT}/lite/tools/check_api_approvals.sh check_modified_file_nums
     if [ "$?" != 0 ];then
        exit 1
     fi