diff --git a/src/PostRA_Scheduler.cpp b/src/PostRA_Scheduler.cpp
index 5268a04..efc18dc 100644
--- a/src/PostRA_Scheduler.cpp
+++ b/src/PostRA_Scheduler.cpp
@@ -1,9 +1,9 @@
 #include "PostRA_Scheduler.h"
-#include <iostream>
 #include <set>
 #include <map>
 #include <vector>
 #include <algorithm>
+#define MAX_SCHEDULING_BLOCK_SIZE 10000 // 限制调度块大小，避免过大导致性能问题
 
 namespace sysy {
 
@@ -306,6 +306,9 @@ void validateSchedule(const std::vector<MachineInstr*>& instr_list) {
 void scheduleBlock(MachineBasicBlock* mbb) {
     auto& instructions = mbb->getInstructions();
     if (instructions.size() <= 1) return;
+    if (instructions.size() > MAX_SCHEDULING_BLOCK_SIZE) {
+      return; // 跳过超大块，防止卡住
+    }
     
     std::vector<MachineInstr*> instr_list;
     for (auto& instr : instructions) {