diff --git a/src/main/java/org/jcnc/snow/compiler/backend/RegisterAllocator.java b/src/main/java/org/jcnc/snow/compiler/backend/RegisterAllocator.java
index 1c425f0..4521b32 100644
--- a/src/main/java/org/jcnc/snow/compiler/backend/RegisterAllocator.java
+++ b/src/main/java/org/jcnc/snow/compiler/backend/RegisterAllocator.java
@@ -2,8 +2,10 @@
 // file: compiler/backend/RegisterAllocator.java
 package org.jcnc.snow.compiler.backend;
 
-import org.jcnc.snow.compiler.ir.*;
-import org.jcnc.snow.compiler.ir.instr.IRFunction;
+import org.jcnc.snow.compiler.ir.core.IRFunction;
+import org.jcnc.snow.compiler.ir.core.IRInstruction;
+import org.jcnc.snow.compiler.ir.core.IRValue;
+import org.jcnc.snow.compiler.ir.value.VirtualRegister;
 
 import java.util.HashMap;
 import java.util.Map;
diff --git a/src/main/java/org/jcnc/snow/compiler/backend/VMCodeGenerator.java b/src/main/java/org/jcnc/snow/compiler/backend/VMCodeGenerator.java
index f61fd34..3acbdf8 100644
--- a/src/main/java/org/jcnc/snow/compiler/backend/VMCodeGenerator.java
+++ b/src/main/java/org/jcnc/snow/compiler/backend/VMCodeGenerator.java
@@ -1,7 +1,10 @@
 package org.jcnc.snow.compiler.backend;
 
-import org.jcnc.snow.compiler.ir.*;
+import org.jcnc.snow.compiler.ir.core.IRFunction;
+import org.jcnc.snow.compiler.ir.core.IRInstruction;
 import org.jcnc.snow.compiler.ir.instr.*;
+import org.jcnc.snow.compiler.ir.value.Constant;
+import org.jcnc.snow.compiler.ir.value.VirtualRegister;
 import org.jcnc.snow.vm.engine.VMOpCode;
 
 import java.lang.reflect.Field;
diff --git a/src/main/java/org/jcnc/snow/compiler/ir/BasicIRBuilder.java b/src/main/java/org/jcnc/snow/compiler/builder/BasicIRBuilder.java
similarity index 91%
rename from src/main/java/org/jcnc/snow/compiler/ir/BasicIRBuilder.java
rename to src/main/java/org/jcnc/snow/compiler/builder/BasicIRBuilder.java
index ff4f534..23f9bff 100644
--- a/src/main/java/org/jcnc/snow/compiler/ir/BasicIRBuilder.java
+++ b/src/main/java/org/jcnc/snow/compiler/builder/BasicIRBuilder.java
@@ -1,9 +1,13 @@
-package org.jcnc.snow.compiler.ir;
+package org.jcnc.snow.compiler.builder;
 
+import org.jcnc.snow.compiler.ir.core.IROp;
+import org.jcnc.snow.compiler.ir.core.IRProgram;
 import org.jcnc.snow.compiler.ir.instr.BinOpInstruction;
-import org.jcnc.snow.compiler.ir.instr.IRFunction;
+import org.jcnc.snow.compiler.ir.core.IRFunction;
 import org.jcnc.snow.compiler.ir.instr.LoadConstInstruction;
 import org.jcnc.snow.compiler.ir.instr.ReturnInstruction;
+import org.jcnc.snow.compiler.ir.value.Constant;
+import org.jcnc.snow.compiler.ir.value.VirtualRegister;
 import org.jcnc.snow.compiler.parser.ast.*;
 import org.jcnc.snow.compiler.parser.ast.base.ExpressionNode;
 import org.jcnc.snow.compiler.parser.ast.base.Node;
@@ -110,10 +114,10 @@ public final class BasicIRBuilder {
      */
     private void stmt(StatementNode n) {
         switch (n) {
-            case ExpressionStatementNode es -> expr(es.expression()); // 表达式语句：只求值，无需保存
-            case AssignmentNode as -> { // 赋值语句
-                VirtualRegister rhs = expr(as.value());
-                variables.put(as.variable(), rhs);
+            case ExpressionStatementNode expressionStatementNode -> expr(expressionStatementNode.expression()); // 表达式语句：只求值，无需保存
+            case AssignmentNode assignmentNode -> { // 赋值语句
+                VirtualRegister virtualRegister = expr(assignmentNode.value());
+                variables.put(assignmentNode.variable(), virtualRegister);
             }
             case DeclarationNode d -> { // 变量声明
                 if (d.getInitializer().isPresent()) { // 有初始化器
diff --git a/src/main/java/org/jcnc/snow/compiler/cli/SnowCompiler.java b/src/main/java/org/jcnc/snow/compiler/cli/SnowCompiler.java
index 7ea8faf..3fec94c 100644
--- a/src/main/java/org/jcnc/snow/compiler/cli/SnowCompiler.java
+++ b/src/main/java/org/jcnc/snow/compiler/cli/SnowCompiler.java
@@ -1,20 +1,14 @@
 package org.jcnc.snow.compiler.cli;
 
-import org.jcnc.snow.compiler.backend.RegisterAllocator;
-import org.jcnc.snow.compiler.backend.VMCodeGenerator;
-import org.jcnc.snow.compiler.ir.BasicIRBuilder;
-import org.jcnc.snow.compiler.ir.IRProgram;
-import org.jcnc.snow.compiler.ir.instr.IRFunction;
+import org.jcnc.snow.compiler.builder.BasicIRBuilder;
+import org.jcnc.snow.compiler.ir.core.IRProgram;
 import org.jcnc.snow.compiler.lexer.core.LexerEngine;
 import org.jcnc.snow.compiler.lexer.token.Token;
-import org.jcnc.snow.compiler.lexer.utils.TokenPrinter;
 import org.jcnc.snow.compiler.parser.ast.base.Node;
 import org.jcnc.snow.compiler.parser.context.ParserContext;
 import org.jcnc.snow.compiler.parser.core.ParserEngine;
 import org.jcnc.snow.compiler.parser.function.ASTPrinter;
 import org.jcnc.snow.compiler.semantic.core.SemanticAnalyzerRunner;
-import org.jcnc.snow.vm.engine.VMMode;
-import org.jcnc.snow.vm.engine.VirtualMachineEngine;
 
 import java.io.IOException;
 import java.nio.charset.StandardCharsets;
diff --git a/src/main/java/org/jcnc/snow/compiler/ir/instr/IRFunction.java b/src/main/java/org/jcnc/snow/compiler/ir/core/IRFunction.java
similarity index 93%
rename from src/main/java/org/jcnc/snow/compiler/ir/instr/IRFunction.java
rename to src/main/java/org/jcnc/snow/compiler/ir/core/IRFunction.java
index bdbbf3b..62eca61 100644
--- a/src/main/java/org/jcnc/snow/compiler/ir/instr/IRFunction.java
+++ b/src/main/java/org/jcnc/snow/compiler/ir/core/IRFunction.java
@@ -1,7 +1,6 @@
-package org.jcnc.snow.compiler.ir.instr;
+package org.jcnc.snow.compiler.ir.core;
 
-import org.jcnc.snow.compiler.ir.IRInstruction;
-import org.jcnc.snow.compiler.ir.VirtualRegister;
+import org.jcnc.snow.compiler.ir.value.VirtualRegister;
 
 import java.util.ArrayList;
 import java.util.List;
diff --git a/src/main/java/org/jcnc/snow/compiler/ir/IRInstruction.java b/src/main/java/org/jcnc/snow/compiler/ir/core/IRInstruction.java
similarity index 93%
rename from src/main/java/org/jcnc/snow/compiler/ir/IRInstruction.java
rename to src/main/java/org/jcnc/snow/compiler/ir/core/IRInstruction.java
index 6d39cae..c79ea3a 100644
--- a/src/main/java/org/jcnc/snow/compiler/ir/IRInstruction.java
+++ b/src/main/java/org/jcnc/snow/compiler/ir/core/IRInstruction.java
@@ -1,4 +1,6 @@
-package org.jcnc.snow.compiler.ir;
+package org.jcnc.snow.compiler.ir.core;
+
+import org.jcnc.snow.compiler.ir.value.VirtualRegister;
 
 import java.util.List;
 
diff --git a/src/main/java/org/jcnc/snow/compiler/ir/IROp.java b/src/main/java/org/jcnc/snow/compiler/ir/core/IROp.java
similarity index 97%
rename from src/main/java/org/jcnc/snow/compiler/ir/IROp.java
rename to src/main/java/org/jcnc/snow/compiler/ir/core/IROp.java
index 905e60b..8481809 100644
--- a/src/main/java/org/jcnc/snow/compiler/ir/IROp.java
+++ b/src/main/java/org/jcnc/snow/compiler/ir/core/IROp.java
@@ -1,4 +1,4 @@
-package org.jcnc.snow.compiler.ir;
+package org.jcnc.snow.compiler.ir.core;
 
 /**
  * IROp —— IR 层支持的操作码（Opcode）枚举类型。
diff --git a/src/main/java/org/jcnc/snow/compiler/ir/IRProgram.java b/src/main/java/org/jcnc/snow/compiler/ir/core/IRProgram.java
similarity index 93%
rename from src/main/java/org/jcnc/snow/compiler/ir/IRProgram.java
rename to src/main/java/org/jcnc/snow/compiler/ir/core/IRProgram.java
index 6104c7b..779ea75 100644
--- a/src/main/java/org/jcnc/snow/compiler/ir/IRProgram.java
+++ b/src/main/java/org/jcnc/snow/compiler/ir/core/IRProgram.java
@@ -1,6 +1,4 @@
-package org.jcnc.snow.compiler.ir;
-
-import org.jcnc.snow.compiler.ir.instr.IRFunction;
+package org.jcnc.snow.compiler.ir.core;
 
 import java.util.ArrayList;
 import java.util.Collections;
diff --git a/src/main/java/org/jcnc/snow/compiler/ir/IRValue.java b/src/main/java/org/jcnc/snow/compiler/ir/core/IRValue.java
similarity index 71%
rename from src/main/java/org/jcnc/snow/compiler/ir/IRValue.java
rename to src/main/java/org/jcnc/snow/compiler/ir/core/IRValue.java
index eec32a2..4129e60 100644
--- a/src/main/java/org/jcnc/snow/compiler/ir/IRValue.java
+++ b/src/main/java/org/jcnc/snow/compiler/ir/core/IRValue.java
@@ -1,4 +1,8 @@
-package org.jcnc.snow.compiler.ir;
+package org.jcnc.snow.compiler.ir.core;
+
+import org.jcnc.snow.compiler.ir.value.Constant;
+import org.jcnc.snow.compiler.ir.value.Label;
+import org.jcnc.snow.compiler.ir.value.VirtualRegister;
 
 /**
  * IRValue —— 表示在中间表示（IR）系统中能作为操作数使用的基本单位。
diff --git a/src/main/java/org/jcnc/snow/compiler/ir/instr/BinOpInstruction.java b/src/main/java/org/jcnc/snow/compiler/ir/instr/BinOpInstruction.java
index bf24067..ec3ac89 100644
--- a/src/main/java/org/jcnc/snow/compiler/ir/instr/BinOpInstruction.java
+++ b/src/main/java/org/jcnc/snow/compiler/ir/instr/BinOpInstruction.java
@@ -1,6 +1,9 @@
 package org.jcnc.snow.compiler.ir.instr;
 
-import org.jcnc.snow.compiler.ir.*;
+import org.jcnc.snow.compiler.ir.core.IRInstruction;
+import org.jcnc.snow.compiler.ir.core.IROp;
+import org.jcnc.snow.compiler.ir.core.IRValue;
+import org.jcnc.snow.compiler.ir.value.VirtualRegister;
 
 import java.util.List;
 
diff --git a/src/main/java/org/jcnc/snow/compiler/ir/instr/LoadConstInstruction.java b/src/main/java/org/jcnc/snow/compiler/ir/instr/LoadConstInstruction.java
index f70c4bc..a327e0c 100644
--- a/src/main/java/org/jcnc/snow/compiler/ir/instr/LoadConstInstruction.java
+++ b/src/main/java/org/jcnc/snow/compiler/ir/instr/LoadConstInstruction.java
@@ -1,6 +1,10 @@
 package org.jcnc.snow.compiler.ir.instr;
 
-import org.jcnc.snow.compiler.ir.*;
+import org.jcnc.snow.compiler.ir.core.IRInstruction;
+import org.jcnc.snow.compiler.ir.core.IROp;
+import org.jcnc.snow.compiler.ir.core.IRValue;
+import org.jcnc.snow.compiler.ir.value.Constant;
+import org.jcnc.snow.compiler.ir.value.VirtualRegister;
 
 import java.util.List;
 
diff --git a/src/main/java/org/jcnc/snow/compiler/ir/instr/ReturnInstruction.java b/src/main/java/org/jcnc/snow/compiler/ir/instr/ReturnInstruction.java
index e769b44..9d70e60 100644
--- a/src/main/java/org/jcnc/snow/compiler/ir/instr/ReturnInstruction.java
+++ b/src/main/java/org/jcnc/snow/compiler/ir/instr/ReturnInstruction.java
@@ -1,6 +1,9 @@
 package org.jcnc.snow.compiler.ir.instr;
 
-import org.jcnc.snow.compiler.ir.*;
+import org.jcnc.snow.compiler.ir.core.IRInstruction;
+import org.jcnc.snow.compiler.ir.core.IROp;
+import org.jcnc.snow.compiler.ir.core.IRValue;
+import org.jcnc.snow.compiler.ir.value.VirtualRegister;
 
 import java.util.List;
 
diff --git a/src/main/java/org/jcnc/snow/compiler/ir/instr/UnaryOpInstruction.java b/src/main/java/org/jcnc/snow/compiler/ir/instr/UnaryOpInstruction.java
index 68aa446..8045bd5 100644
--- a/src/main/java/org/jcnc/snow/compiler/ir/instr/UnaryOpInstruction.java
+++ b/src/main/java/org/jcnc/snow/compiler/ir/instr/UnaryOpInstruction.java
@@ -1,6 +1,9 @@
 package org.jcnc.snow.compiler.ir.instr;
 
-import org.jcnc.snow.compiler.ir.*;
+import org.jcnc.snow.compiler.ir.core.IRInstruction;
+import org.jcnc.snow.compiler.ir.core.IROp;
+import org.jcnc.snow.compiler.ir.core.IRValue;
+import org.jcnc.snow.compiler.ir.value.VirtualRegister;
 
 import java.util.List;
 
diff --git a/src/main/java/org/jcnc/snow/compiler/ir/Constant.java b/src/main/java/org/jcnc/snow/compiler/ir/value/Constant.java
similarity index 85%
rename from src/main/java/org/jcnc/snow/compiler/ir/Constant.java
rename to src/main/java/org/jcnc/snow/compiler/ir/value/Constant.java
index a0fb459..e692d12 100644
--- a/src/main/java/org/jcnc/snow/compiler/ir/Constant.java
+++ b/src/main/java/org/jcnc/snow/compiler/ir/value/Constant.java
@@ -1,4 +1,6 @@
-package org.jcnc.snow.compiler.ir;
+package org.jcnc.snow.compiler.ir.value;
+
+import org.jcnc.snow.compiler.ir.core.IRValue;
 
 /**
  * Constant 类 —— 表示一个常量值（例如整数常量、字符串常量等）。
diff --git a/src/main/java/org/jcnc/snow/compiler/ir/Label.java b/src/main/java/org/jcnc/snow/compiler/ir/value/Label.java
similarity index 87%
rename from src/main/java/org/jcnc/snow/compiler/ir/Label.java
rename to src/main/java/org/jcnc/snow/compiler/ir/value/Label.java
index 4dd16cf..f9d7d62 100644
--- a/src/main/java/org/jcnc/snow/compiler/ir/Label.java
+++ b/src/main/java/org/jcnc/snow/compiler/ir/value/Label.java
@@ -1,4 +1,6 @@
-package org.jcnc.snow.compiler.ir;
+package org.jcnc.snow.compiler.ir.value;
+
+import org.jcnc.snow.compiler.ir.core.IRValue;
 
 /**
  * Label —— 表示 IR 中的跳转目标标签。
diff --git a/src/main/java/org/jcnc/snow/compiler/ir/VirtualRegister.java b/src/main/java/org/jcnc/snow/compiler/ir/value/VirtualRegister.java
similarity index 89%
rename from src/main/java/org/jcnc/snow/compiler/ir/VirtualRegister.java
rename to src/main/java/org/jcnc/snow/compiler/ir/value/VirtualRegister.java
index ae531fb..e4c8411 100644
--- a/src/main/java/org/jcnc/snow/compiler/ir/VirtualRegister.java
+++ b/src/main/java/org/jcnc/snow/compiler/ir/value/VirtualRegister.java
@@ -1,4 +1,6 @@
-package org.jcnc.snow.compiler.ir;
+package org.jcnc.snow.compiler.ir.value;
+
+import org.jcnc.snow.compiler.ir.core.IRValue;
 
 /**
  * VirtualRegister —— 表示一个 SSA（静态单赋值）虚拟寄存器。