diff --git a/src/mir/AsmPrinter.cpp b/src/mir/AsmPrinter.cpp
index 350a3b4..3ea7d37 100644
--- a/src/mir/AsmPrinter.cpp
+++ b/src/mir/AsmPrinter.cpp
@@ -5,7 +5,7 @@
 
 #include "utils/Log.h"
 
-#define DEBUG_Asm
+//#define DEBUG_Asm
 
 #ifdef DEBUG_Asm
 #include <iostream>
@@ -53,6 +53,7 @@ void PrintOperand(std::ostream& os, const Operand& op) {
       os << CondCodeName(op.GetCondCode());
       break;
     case Operand::Kind::Label:
+      DEBUG_MSG("label is" << op.GetLabel());
       os << op.GetLabel();
       break;
   }
diff --git a/src/mir/Lowering.cpp b/src/mir/Lowering.cpp
index 7098107..4d6f513 100644
--- a/src/mir/Lowering.cpp
+++ b/src/mir/Lowering.cpp
@@ -6,6 +6,14 @@
 #include "ir/IR.h"
 #include "utils/Log.h"
 
+#define DEBUG_Lower
+
+#ifdef DEBUG_Lower
+#include <iostream>
+#define DEBUG_MSG(msg) std::cerr << "[Lower Debug] " << msg << std::endl
+#else
+#define DEBUG_MSG(msg)
+#endif
 
 namespace mir {
 namespace {
@@ -392,7 +400,8 @@ void LowerInstruction(const ir::Instruction& inst, MachineFunction& function,
         // 无条件跳转: br label %target
         const ir::BasicBlock* irTarget = br.GetTarget();
         std::string targetLabel = GetBlockLabel(irTarget);
-        
+        DEBUG_MSG("br: targetLabel is " << GetBlockLabel(irTarget));
+
         // 生成 B target_label
         block.Append(Opcode::B, {Operand::Label(targetLabel)});
       }
@@ -646,8 +655,10 @@ std::unique_ptr<MachineFunction> LowerFunction(const ir::Function& func) {
   std::unordered_map<const ir::BasicBlock*, MachineBasicBlock*> blockMap;
   
   // 第一遍：为每个 IR 基本块创建 MIR 基本块
+  std::string func_name = func.GetName(); 
   for (const auto& bb : func.GetBlocks()) {
-    auto mirBB = std::make_unique<MachineBasicBlock>(bb->GetName());
+    // 格式: .L函数名_基本块名
+    auto mirBB = std::make_unique<MachineBasicBlock>(".L" + func_name + "_" + bb->GetName());
     blockMap[bb.get()] = mirBB.get();
     machine_func->AddBasicBlock(std::move(mirBB));
   }