diff --git a/src/main/java/org/jcnc/snow/compiler/ir/builder/FunctionBuilder.java b/src/main/java/org/jcnc/snow/compiler/ir/builder/FunctionBuilder.java
index 2885bcd..25f6efe 100644
--- a/src/main/java/org/jcnc/snow/compiler/ir/builder/FunctionBuilder.java
+++ b/src/main/java/org/jcnc/snow/compiler/ir/builder/FunctionBuilder.java
@@ -24,7 +24,7 @@ import org.jcnc.snow.compiler.parser.ast.base.StatementNode;
 final class FunctionBuilder {
 
     /** 当前正在构建的 IRFunction 实例 */
-    private IRFunction fn;
+    private IRFunction irFunction;
 
     /** 管理变量名到虚拟寄存器的映射 */
     private final Scope scope = new Scope();
@@ -32,19 +32,19 @@ final class FunctionBuilder {
     /**
      * 将给定的 FunctionNode 转换为 IRFunction。
      *
-     * @param node 要转换的函数节点
+     * @param functionNode 要转换的函数节点
      * @return 构建完成的 IRFunction
      */
-    IRFunction build(FunctionNode node) {
-        fn = new IRFunction(node.name());
-        scope.attachFunction(fn);
-        for (ParameterNode p : node.parameters()) {
+    IRFunction build(FunctionNode functionNode) {
+        irFunction = new IRFunction(functionNode.name());
+        scope.attachFunction(irFunction);
+        for (ParameterNode p : functionNode.parameters()) {
             scope.declare(p.name());
         }
-        for (StatementNode s : node.body()) {
+        for (StatementNode s : functionNode.body()) {
             stmt(s);
         }
-        return fn;
+        return irFunction;
     }
 
     /**
@@ -77,9 +77,9 @@ final class FunctionBuilder {
             case ReturnNode r -> {
                 // 处理返回语句，区分是否带返回值
                 if (r.getExpression().isPresent()) {
-                    fn.add(new ReturnInstruction(expr(r.getExpression().get())));
+                    irFunction.add(new ReturnInstruction(expr(r.getExpression().get())));
                 } else {
-                    fn.add(new ReturnInstruction(null));
+                    irFunction.add(new ReturnInstruction(null));
                 }
             }
             case null, default -> throw new IllegalStateException("Unsupported statement: " + s);
@@ -115,8 +115,8 @@ final class FunctionBuilder {
      * @return 存放常量的虚拟寄存器
      */
     private VirtualRegister number(NumberLiteralNode n) {
-        VirtualRegister vr = fn.newRegister();
-        fn.add(new LoadConstInstruction(vr, new Constant(Integer.parseInt(n.value()))));
+        VirtualRegister vr = irFunction.newRegister();
+        irFunction.add(new LoadConstInstruction(vr, new Constant(Integer.parseInt(n.value()))));
         return vr;
     }
 
@@ -129,7 +129,7 @@ final class FunctionBuilder {
     private VirtualRegister bin(BinaryExpressionNode b) {
         VirtualRegister l = expr(b.left());
         VirtualRegister r = expr(b.right());
-        VirtualRegister d = fn.newRegister();
+        VirtualRegister d = irFunction.newRegister();
 
         IROp op = switch (b.operator()) {
             case "+" -> IROp.ADD_I32;
@@ -139,7 +139,7 @@ final class FunctionBuilder {
             default -> throw new IllegalStateException("Unknown operator " + b.operator());
         };
 
-        fn.add(new BinOpInstruction(op, d, l, r));
+        irFunction.add(new BinOpInstruction(op, d, l, r));
         return d;
     }
 }
\ No newline at end of file