diff --git a/framework/tools/hdi-gen/util/string_helper.h b/framework/tools/hdi-gen/util/string_helper.h
index 0e10a65abfcbd78aefbd7a30756db45b045cc464..f3c7aaf95aa713e34c5aaf1ec8ec0d533facb5c1 100644
--- a/framework/tools/hdi-gen/util/string_helper.h
+++ b/framework/tools/hdi-gen/util/string_helper.h
@@ -45,9 +45,9 @@ public:
     static std::string Format(const char *format, ...);
 
     static constexpr size_t lineMaxSize = 1024; // 1KB
-    static constexpr size_t maxSize = 262144;    // 256KB
+    static constexpr size_t maxSize = 524288;    // 512KB
 };
 } // namespace HDI
 } // namespace OHOS
 
-#endif // OHOS_HDI_STRING_HELPER_H
\ No newline at end of file
+#endif // OHOS_HDI_STRING_HELPER_H