diff --git a/CMakeLists.txt b/CMakeLists.txt
index f5b9ec25aa1451f466d26b2edc79296a5579b2f7..2532ecf24367c0efd8cc6bda90209e77008a4a54 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -14,11 +14,16 @@ file(GLOB_RECURSE PADDLE_MOBILE_CC src/*.cc src/*.cpp src/*.c src/*.mm)
 file(GLOB_RECURSE PADDLE_MOBILE_H src/*.h)
 include_directories(src/)
 
-set(CMAKE_CXX_FLAGS "-std=c++14 -O3 -s ${CMAKE_CXX_FLAGS}")
+if(IS_IOS)
+    set(CMAKE_CXX_FLAGS "-fobjc-abi-version=2 -fobjc-arc -std=gnu++11 -stdlib=libc++ -O3 -s -isysroot ${CMAKE_OSX_SYSROOT} ${CMAKE_CXX_FLAGS}")
+else()
+    set(CMAKE_CXX_FLAGS "-std=c++14 -O3 -s ${CMAKE_CXX_FLAGS}")
+endif()
+
 if (DEBUGING)
     message(STATUS "debug")
-    set(CMAKE_BUILD_TYPE Debug)
-    set(CMAKE_CXX_FLAGS_DEBUG "-g -DNDEBUG")
+    set(CMAKE_BUILD_TYPE Release)
+    set(CMAKE_CXX_FLAGS_RELEASE "-DNDEBUG")
     add_definitions(-DPADDLE_MOBILE_DEBUG)
 else ()
     set(CMAKE_BUILD_TYPE Release)
diff --git a/tools/build.sh b/tools/build.sh
index e1a47e64e6ea87dd9d70969214412fc0c2fa2d67..ce330e6d631ea1009f28ccf987a50e5f79a032b6 100755
--- a/tools/build.sh
+++ b/tools/build.sh
@@ -94,8 +94,6 @@ build_for_ios() {
     MODE="Release"
     BUILD_DIR=../build/release/"${PLATFORM}"
     TOOLCHAIN_FILE="./tools/ios-cmake/ios.toolchain.cmake"
-    C_FLAGS="-fobjc-abi-version=2 -fobjc-arc -isysroot ${CMAKE_OSX_SYSROOT}"
-    CXX_FLAGS="-fobjc-abi-version=2 -fobjc-arc -std=gnu++14 -stdlib=libc++ -isysroot ${CMAKE_OSX_SYSROOT}"
     mkdir -p "${BUILD_DIR}"
     if [ $# -eq 1 ]; then
         cmake .. \
@@ -103,8 +101,6 @@ build_for_ios() {
             -DCMAKE_BUILD_TYPE="${MODE}" \
             -DCMAKE_TOOLCHAIN_FILE="${TOOLCHAIN_FILE}" \
             -DIOS_PLATFORM=OS \
-            -DCMAKE_C_FLAGS="${C_FLAGS}" \
-            -DCMAKE_CXX_FLAGS="${CXX_FLAGS}" \
             -DNET=$1 \
             -DIS_IOS="true"
     else
@@ -113,8 +109,6 @@ build_for_ios() {
             -DCMAKE_BUILD_TYPE="${MODE}" \
             -DCMAKE_TOOLCHAIN_FILE="${TOOLCHAIN_FILE}" \
             -DIOS_PLATFORM=OS \
-            -DCMAKE_C_FLAGS="${C_FLAGS}" \
-            -DCMAKE_CXX_FLAGS="${CXX_FLAGS}" \
             -DIS_IOS="true"
     fi
     cd "${BUILD_DIR}"