diff --git a/interfaces/innerkits/syspara/param_wrapper.cpp b/interfaces/innerkits/syspara/param_wrapper.cpp
index 4a7d5f29a20876a05daf84be901a0ee2611f55dd..810f6127d0d93c290162ff767d9ce436ae83b077 100644
--- a/interfaces/innerkits/syspara/param_wrapper.cpp
+++ b/interfaces/innerkits/syspara/param_wrapper.cpp
@@ -164,7 +164,7 @@ std::string GetDeviceType(void)
     };
     static const char *productType = nullptr;
     const char *type = GetProperty("const.build.devicetype", &productType);
-    if (type == NULL) {
+    if (type == nullptr) {
         type = GetProperty("const.build.characteristics", &productType);
     }
     if (deviceTypeMap.count(type) != 0) {