diff --git a/libs/mips/include/mips/mips_manager.h b/libs/mips/include/mips/mips_manager.h
index 8413eb0..f18c33f 100644
--- a/libs/mips/include/mips/mips_manager.h
+++ b/libs/mips/include/mips/mips_manager.h
@@ -31,6 +31,7 @@ class MipsManager {
     ZeroReg *zero;
     StkPtrReg *sp;
     RetAddrReg *ra;
+    ArgumentReg *a0;
     ValueReg *v0;
     // f0 和 f12 保留，用于输入输出
     FloatReg *f0;
diff --git a/libs/mips/src/mips_manager.cpp b/libs/mips/src/mips_manager.cpp
index 10fba36..01ba060 100644
--- a/libs/mips/src/mips_manager.cpp
+++ b/libs/mips/src/mips_manager.cpp
@@ -15,6 +15,7 @@ MipsManager::MipsManager() {
     zero = new ZeroReg();
     sp = new StkPtrReg();
     ra = new RetAddrReg();
+    a0 = new ArgumentReg(0);
     v0 = new ValueReg(0);
     f0 = new FloatReg(0);
     f12 = new FloatReg(12);
@@ -42,6 +43,7 @@ MipsManager::~MipsManager() {
     delete zero;
     delete sp;
     delete ra;
+    delete a0;
     delete v0;
     delete f0;
     delete f12;
diff --git a/libs/mips/src/translator.cpp b/libs/mips/src/translator.cpp
index 8b0bcca..ecd2f2b 100644
--- a/libs/mips/src/translator.cpp
+++ b/libs/mips/src/translator.cpp
@@ -416,4 +416,8 @@ void Translator::translate(OutputInstPtr outputInstPtr) {
     manager->addCode(new RCode(AddS, manager->f12, reg, reg0));
     manager->addCode(new ICode(Addiu, manager->v0, manager->zero, 2));
     manager->addCode(new RCode(Syscall));
+    // for test: put '\n'
+    manager->addCode(new ICode(Addiu, manager->a0, manager->zero, 10));
+    manager->addCode(new ICode(Addiu, manager->v0, manager->zero, 11));
+    manager->addCode(new RCode(Syscall));
 }
diff --git a/tests/test_mips.cpp b/tests/test_mips.cpp
index aa27123..677789b 100644
--- a/tests/test_mips.cpp
+++ b/tests/test_mips.cpp
@@ -146,6 +146,9 @@ l.s $f14, flt1
 add.s $f12, $f13, $f14
 addiu $v0, $zero, 2
 syscall
+addiu $a0, $zero, 10
+addiu $v0, $zero, 11
+syscall
 j main_5
 nop