diff --git a/tools/cmake.py b/tools/cmake.py
index 5b43c39409..88a95ecad8 100644
--- a/tools/cmake.py
+++ b/tools/cmake.py
@@ -49,10 +49,10 @@ def GenerateCFiles(env,project):
         cm_file.write("SET(CMAKE_SIZE \""+ SIZE + "\")\n\n")
 
 
-        cm_file.write("SET(CMAKE_C_FLAGS \""+ rtconfig.CFLAGS + "\")\n")
-        cm_file.write("SET(CMAKE_CXX_FLAGS \""+ rtconfig.CXXFLAGS + "\")\n")
-        cm_file.write("SET(CMAKE_ASM_FLAGS \""+ rtconfig.AFLAGS + "\")\n")
-        cm_file.write("SET(CMAKE_EXE_LINKER_FLAGS \""+ re.sub('-T(\s*)', '-T ${CMAKE_SOURCE_DIR}/',rtconfig.LFLAGS) + "\")\n\n")
+        cm_file.write("SET(CMAKE_C_FLAGS \""+ rtconfig.CFLAGS.replace('\\', "/") + "\")\n")
+        cm_file.write("SET(CMAKE_CXX_FLAGS \""+ rtconfig.CXXFLAGS.replace('\\', "/") + "\")\n")
+        cm_file.write("SET(CMAKE_ASM_FLAGS \""+ rtconfig.AFLAGS.replace('\\', "/") + "\")\n")
+        cm_file.write("SET(CMAKE_EXE_LINKER_FLAGS \""+ re.sub('-T(\s*)', '-T ${CMAKE_SOURCE_DIR}/',rtconfig.LFLAGS.replace('\\', "/")) + "\")\n\n")
         
         cm_file.write("SET(CMAKE_CXX_STANDARD 14)\n")
         cm_file.write("PROJECT(rtthread C CXX ASM)\n")