diff --git a/components/ble/ble_flags.cmake b/components/ble/ble_flags.cmake
index 4be7e4d4..6b43e04e 100644
--- a/components/ble/ble_flags.cmake
+++ b/components/ble/ble_flags.cmake
@@ -3,7 +3,7 @@ list(APPEND CFLAGS -DARCH_RISCV)
 
 string(TOUPPER ${CHIP} CHIP_NAME)
 list(APPEND CFLAGS -D${CHIP_NAME})
-if(${CHIP} STREQUAL "bl602")
+if("${CHIP}" STREQUAL "bl602")
 list(APPEND CFLAGS -DCONFIG_SET_TX_PWR)
 endif()
 
diff --git a/tools/cmake/compiler_flags.cmake b/tools/cmake/compiler_flags.cmake
index c1807fbc..36361e11 100644
--- a/tools/cmake/compiler_flags.cmake
+++ b/tools/cmake/compiler_flags.cmake
@@ -9,7 +9,7 @@ list(APPEND GLOBAL_LD_FLAGS -Wall -Wchar-subscripts -std=c99)
 list(APPEND GLOBAL_LD_FLAGS --specs=nano.specs)
 
 
-if(${SUPPORT_FLOAT} STREQUAL "y")
+if("${SUPPORT_FLOAT}" STREQUAL "y")
 list(APPEND GLOBAL_LD_FLAGS -u _printf_float)
 endif()
 
diff --git a/tools/cmake/tools.cmake b/tools/cmake/tools.cmake
index ef07190c..70282400 100644
--- a/tools/cmake/tools.cmake
+++ b/tools/cmake/tools.cmake
@@ -193,7 +193,7 @@ if(DEFINED APP)
     foreach(cmakelists_file ${cmakelists_files})
     get_filename_component(app_relative_dir ${cmakelists_file} DIRECTORY)
     get_filename_component(app_name ${app_relative_dir} NAME)
-        if(${APP} STREQUAL "all")
+        if("${APP}" STREQUAL "all")
             message(STATUS "[run app:${app_name}], path:${app_relative_dir}")
             add_subdirectory(${app_relative_dir})
             set(app_find_ok 1)