diff --git a/src/include/midend/SysYIRGenerator.h b/src/include/midend/SysYIRGenerator.h
index b4d4e57..70fca7f 100644
--- a/src/include/midend/SysYIRGenerator.h
+++ b/src/include/midend/SysYIRGenerator.h
@@ -51,6 +51,7 @@ public:
                          Module *pModule, IRBuilder *pBuilder);
 
   static void initExternalFunction(Module *pModule, IRBuilder *pBuilder);
+  static void modify_timefuncname(Module *pModule);
 };
 
 class SysYIRGenerator : public SysYBaseVisitor {
diff --git a/src/midend/SysYIRGenerator.cpp b/src/midend/SysYIRGenerator.cpp
index b2a52be..e6840a0 100644
--- a/src/midend/SysYIRGenerator.cpp
+++ b/src/midend/SysYIRGenerator.cpp
@@ -674,6 +674,8 @@ std::any SysYIRGenerator::visitCompUnit(SysYParser::CompUnitContext *ctx) {
   pModule->enterNewScope();
   visitChildren(ctx);
   pModule->leaveScope();
+
+  Utils::modify_timefuncname(pModule);
   return pModule;
 }
 
@@ -2403,4 +2405,12 @@ void Utils::initExternalFunction(Module *pModule, IRBuilder *pBuilder) {
 
 }
 
+void Utils::modify_timefuncname(Module *pModule){
+  auto starttimeFunc = pModule->getExternalFunction("starttime");
+  auto stoptimeFunc = pModule->getExternalFunction("stoptime");
+  starttimeFunc->setName("_sysy_starttime");
+  stoptimeFunc->setName("_sysy_stoptime");
+
+}
+
 } // namespace sysy
\ No newline at end of file