diff --git a/.run/测试.run.xml b/.run/测试.run.xml
index 5000363..c37e7f3 100644
--- a/.run/测试.run.xml
+++ b/.run/测试.run.xml
@@ -3,7 +3,6 @@
     <toRun name="Demo1" type="Application" />
     <toRun name="Demo10" type="Application" />
     <toRun name="Demo11" type="Application" />
-    <toRun name="Demo11" type="Application" />
     <toRun name="Demo12" type="Application" />
     <toRun name="Demo13" type="Application" />
     <toRun name="Demo2" type="Application" />
diff --git a/playground/Demo/Demo14/BuiltinUtils.snow b/playground/Demo/Demo14/BuiltinUtils.snow
new file mode 100644
index 0000000..d915ee8
--- /dev/null
+++ b/playground/Demo/Demo14/BuiltinUtils.snow
@@ -0,0 +1,19 @@
+module: BuiltinUtils
+  function: print
+    parameter:
+      declare msg: int
+    return_type: void
+    body:
+      syscall("PRINT",1)
+    end body
+  end function
+
+  function: println
+    parameter:
+      declare msg: int
+    return_type: void
+    body:
+      syscall("PRINTLN",1)
+    end body
+  end function
+end module
diff --git a/playground/Demo/Demo14/Main.snow b/playground/Demo/Demo14/Main.snow
new file mode 100644
index 0000000..baf23e4
--- /dev/null
+++ b/playground/Demo/Demo14/Main.snow
@@ -0,0 +1,11 @@
+module: Main
+  import: BuiltinUtils
+
+  function: main
+    return_type: void
+    body:
+      BuiltinUtils.print(1)
+      BuiltinUtils.println(2)
+    end body
+  end function
+end module
\ No newline at end of file
diff --git a/src/main/java/org/jcnc/snow/compiler/semantic/core/BuiltinTypeRegistry.java b/src/main/java/org/jcnc/snow/compiler/semantic/core/BuiltinTypeRegistry.java
index d1566ab..3e69f38 100644
--- a/src/main/java/org/jcnc/snow/compiler/semantic/core/BuiltinTypeRegistry.java
+++ b/src/main/java/org/jcnc/snow/compiler/semantic/core/BuiltinTypeRegistry.java
@@ -1,54 +1,74 @@
 package org.jcnc.snow.compiler.semantic.core;
 
-import org.jcnc.snow.compiler.semantic.type.*;
+import org.jcnc.snow.compiler.semantic.type.BuiltinType;
+import org.jcnc.snow.compiler.semantic.type.FunctionType;
+import org.jcnc.snow.compiler.semantic.type.Type;
 
-import java.util.Map;
+import java.util.*;
 
 /**
- * {@code BuiltinTypeRegistry} 是内置类型和内置模块的集中注册中心。
- * <p>
- * 本类主要负责: 
+ * 语言全部内置类型 / 模块 / 函数的注册中心。
+ *
+ * <p>目前同时注册：</p>
  * <ul>
- *   <li>定义语言中所有可识别的基础类型（如 int、float、string 等）；</li>
- *   <li>在语义分析初始化时，将内置模块（如 {@code BuiltinUtils}）注册到上下文中；</li>
- *   <li>提供对内置类型的快速查找支持。</li>
+ *   <li>所有基础类型（byte、short、int …）</li>
+ *   <li>标准库模块 <b>BuiltinUtils</b> —— 仅声明函数签名，真正实现写在 Snow 源码中</li>
+ *   <li>运行时内核函数 <b>syscall</b> —— 供标准库内部实现调用</li>
  * </ul>
- * 该类为纯工具类，所有成员均为静态，不可实例化。
  */
 public final class BuiltinTypeRegistry {
 
-    /**
-     * 内置类型映射表: 将类型名称字符串映射到对应的 {@link Type} 实例。
-     * <p>
-     * 用于类型解析过程（如解析变量声明或函数返回类型）中，
-     * 将用户源码中的类型字符串转换为语义类型对象。
-     */
-    public static final Map<String, Type> BUILTIN_TYPES = Map.of(
-            "int",    BuiltinType.INT,
-            "long",   BuiltinType.LONG,
-            "short",  BuiltinType.SHORT,
-            "byte",   BuiltinType.BYTE,
-            "float",  BuiltinType.FLOAT,
-            "double", BuiltinType.DOUBLE,
-            "string", BuiltinType.STRING,
-            "boolean", BuiltinType.BOOLEAN,
-            "void",   BuiltinType.VOID
-    );
+    /** 基础类型表：名称 → Type */
+    public static final Map<String, Type> BUILTIN_TYPES;
+    static {
+        Map<String, Type> t = new HashMap<>();
+        t.put("byte",   BuiltinType.BYTE);
+        t.put("short",  BuiltinType.SHORT);
+        t.put("int",    BuiltinType.INT);
+        t.put("long",   BuiltinType.LONG);
+        t.put("float",  BuiltinType.FLOAT);
+        t.put("double", BuiltinType.DOUBLE);
+        t.put("string", BuiltinType.STRING);
+        t.put("void",   BuiltinType.VOID);
+        BUILTIN_TYPES = Collections.unmodifiableMap(t);
+    }
 
-    /**
-     * 私有构造函数，禁止实例化。
-     */
     private BuiltinTypeRegistry() { }
 
     /**
-     * 初始化语义上下文中与内置模块相关的内容。
-     * <p>
-     * 当前实现将内置模块 {@code BuiltinUtils} 注册至上下文模块表中，
-     * 使其在用户代码中可被访问（如 {@code BuiltinUtils.to_string(...)}）。
-     *
-     * @param ctx 当前语义分析上下文
+     * 供语义分析阶段调用：向上下文注入所有内置模块 / 函数声明。
      */
     public static void init(Context ctx) {
+        /* ---------- BuiltinUtils ---------- */
+        ModuleInfo utils = new ModuleInfo("BuiltinUtils");
 
+        // print(string): void
+        utils.getFunctions().put(
+                "print",
+                new FunctionType(
+                        Collections.singletonList(BuiltinType.STRING),
+                        BuiltinType.VOID
+                )
+        );
+
+        // println(string): void
+        utils.getFunctions().put(
+                "println",
+                new FunctionType(
+                        Collections.singletonList(BuiltinType.STRING),
+                        BuiltinType.VOID
+                )
+        );
+
+        // syscall(string, string): void   —— 供 BuiltinUtils 内部使用
+        utils.getFunctions().put(
+                "syscall",
+                new FunctionType(
+                        Arrays.asList(BuiltinType.STRING, BuiltinType.STRING),
+                        BuiltinType.VOID
+                )
+        );
+
+        ctx.getModules().putIfAbsent("BuiltinUtils", utils);
     }
 }