diff --git a/CMakeLists.txt b/CMakeLists.txt
index a6618dc4e..4e7dfbb7e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -14,6 +14,7 @@ SET(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${CMAKE_SOURCE_DIR}/cmake)
 if(NOT CMAKE_BUILD_TYPE)
     set(CMAKE_BUILD_TYPE Debug CACHE STRING "Build type:Default is debug" FORCE)
 endif()
+string(TOLOWER "${CMAKE_BUILD_TYPE}" CMAKE_BUILD_TYPE_LOWER)
 
 # 输出当前构建类型
 message(STATUS "Using build type: ${CMAKE_BUILD_TYPE}")
@@ -54,6 +55,12 @@ ENDIF(WIN32)
 # This is for clangd plugin for vscode
 # mute sign-compare error in lex/yacc
 SET(CMAKE_COMMON_FLAGS "${CMAKE_COMMON_FLAGS} -Wall -Werror -Wno-error=sign-compare")
+IF ("${CMAKE_BUILD_TYPE_LOWER}" STREQUAL "debug")
+    SET(CMAKE_COMMON_FLAGS "${CMAKE_COMMON_FLAGS} -DDEBUG -g -O0")
+ELSEIF ("${CMAKE_BUILD_TYPE_LOWER}" STREQUAL "release")
+    SET(CMAKE_COMMON_FLAGS "${CMAKE_COMMON_FLAGS} -g -O2")
+ENDIF()
+
 IF (ENABLE_NOPIE)
     SET(CMAKE_COMMON_FLAGS "${CMAKE_COMMON_FLAGS} -no-pie")
     ADD_LINK_OPTIONS(-no-pie)
@@ -160,11 +167,6 @@ ENDIF(WITH_UNIT_TESTS)
 SET(CMAKE_CXX_FLAGS ${CMAKE_COMMON_FLAGS})
 SET(CMAKE_C_FLAGS ${CMAKE_COMMON_FLAGS})
 
-set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} -g -O0 -DDEBUG")
-set(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} -O2")
-set(CMAKE_C_FLAGS_RELWITHDEBINFO "${CMAKE_C_FLAGS_RELWITHDEBINFO} -O2 -g -DDEBUG")
-set(CMAKE_C_FLAGS_MINSIZEREL "${CMAKE_C_FLAGS_MINSIZEREL} -Os")
-
 MESSAGE(STATUS "CMAKE_CXX_FLAGS is " ${CMAKE_CXX_FLAGS})
 
 # ADD_SUBDIRECTORY(src bin)  bin 为目标目录， 可以省略