diff --git a/src/mir/Lowering.cpp b/src/mir/Lowering.cpp
index a509514..cfb6285 100644
--- a/src/mir/Lowering.cpp
+++ b/src/mir/Lowering.cpp
@@ -590,8 +590,11 @@ void LowerInstruction(const ir::Instruction& inst, MachineFunction& function,
           EmitValueToReg(arg, reg, slots, block, function);
           fpArgCount++;
         } else {
-          // 整数参数
-          PhysReg reg = static_cast<PhysReg>(static_cast<int>(PhysReg::W0) + intArgCount);
+          // 区分指针与普通整数：指针使用 64 位 Xn 寄存器
+          bool isPointer = argType->IsPtrInt32() || argType->IsPtrFloat() || argType->IsPtrInt1() ||
+                          argType->IsArray(); // 数组在作为函数参数时会退化为指针
+          PhysReg baseReg = isPointer ? PhysReg::X0 : PhysReg::W0;
+          PhysReg reg = static_cast<PhysReg>(static_cast<int>(baseReg) + intArgCount);
           EmitValueToReg(arg, reg, slots, block, function);
           intArgCount++;
         }