diff --git a/CMakeLists.txt b/CMakeLists.txt
index 89fbe0b668a8339fe59fb419f9324973e82849d7..99032ada82dc6c0e085bc9d4e6b98ee204f63d33 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -17,8 +17,10 @@ elseif(FPGA)
     add_definitions(-DPADDLE_MOBILE_FPGA)
 endif()
 
+set(CMAKE_CXX_FLAGS "-std=c++14 -O3 -s ${CMAKE_CXX_FLAGS}")
 if (DEBUGING)
     set(CMAKE_BUILD_TYPE Debug)
+    set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS}")
 else()
     set(CMAKE_BUILD_TYPE Release)
 endif ()
@@ -55,7 +57,6 @@ else ()
     add_definitions(-DX86)
 endif()
 
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++14")
 set(CMAKE_VERBOSE_MAKEFILE ON)
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY build)
diff --git a/tools/build.sh b/tools/build.sh
index 580508c7ed17f4e2c76769e601521b6f4b25b5ba..4ac63315a94798d3aca63fb62aef511c4146cd3c 100755
--- a/tools/build.sh
+++ b/tools/build.sh
@@ -15,7 +15,6 @@ build_for_mac() {
     fi
     PLATFORM="x86"
     MODE="Release"
-    CXX_FLAGS="-std=c++11 -O3 -s"
     BUILD_DIR=../build/release/"${PLATFORM}"
     mkdir -p ${BUILD_DIR}/build
 
@@ -25,7 +24,6 @@ build_for_mac() {
     cmake .. \
         -B"${BUILD_DIR}" \
     	-DCMAKE_BUILD_TYPE="${MODE}" \
-    	-DCMAKE_CXX_FLAGS="${CXX_FLAGS}" \
     	-DIS_MAC=true
 
     cd ${BUILD_DIR}
@@ -46,11 +44,11 @@ build_for_android() {
     if [ "${PLATFORM}" = "arm-v7a" ]; then
         ABI="armeabi-v7a with NEON"
         ARM_PLATFORM="V7"
-        CXX_FLAGS="-O3 -std=c++11 -s -march=armv7-a -mfpu=neon -mfloat-abi=softfp -pie -fPIE -w -Wno-error=format-security"
+        CXX_FLAGS="-march=armv7-a -mfpu=neon -mfloat-abi=softfp -pie -fPIE -w -Wno-error=format-security"
     elif [ "${PLATFORM}" = "arm-v8a" ]; then
         ABI="arm64-v8a"
         ARM_PLATFORM="V8"
-        CXX_FLAGS="-O3 -std=c++11 -s -march=armv8-a  -pie -fPIE -w -Wno-error=format-security -llog"
+        CXX_FLAGS="-march=armv8-a  -pie -fPIE -w -Wno-error=format-security -llog"
     else
         echo "unknown platform!"
         exit -1