diff --git a/src/main/java/com/axis/innovators/box/Main.java b/src/main/java/com/axis/innovators/box/Main.java
index 8028ac2..50d9afb 100644
--- a/src/main/java/com/axis/innovators/box/Main.java
+++ b/src/main/java/com/axis/innovators/box/Main.java
@@ -26,6 +26,7 @@ public class Main {
     private static final String[] AUTHOR = new String[]{
             "tzdwindows 7"
     };
+
     /** 我是总任务数 **/
     public int totalTasks = 1;
     /** 我是当前任务数 **/
diff --git a/src/main/java/com/axis/innovators/box/plugins/BoxClassLoader.java b/src/main/java/com/axis/innovators/box/plugins/BoxClassLoader.java
index db49ccc..d730ce0 100644
--- a/src/main/java/com/axis/innovators/box/plugins/BoxClassLoader.java
+++ b/src/main/java/com/axis/innovators/box/plugins/BoxClassLoader.java
@@ -1,30 +1,39 @@
 package com.axis.innovators.box.plugins;
 
-import org.objectweb.asm.ClassReader;
-import org.objectweb.asm.ClassWriter;
-
 import java.io.IOException;
 import java.io.InputStream;
 import java.net.URL;
 import java.net.URLClassLoader;
 import java.util.ArrayList;
 import java.util.List;
+import java.util.Collections;
+import java.util.concurrent.CopyOnWriteArrayList;
 
+/**
+ * 自定义类加载器，装载CorePlugins
+ * @author tzdwindows 7
+ */
 public class BoxClassLoader extends URLClassLoader {
-    private static final List<IClassTransformer> CLASS_TRANSFORMS = new ArrayList<>();
+    private static final List<IClassTransformer> CLASS_TRANSFORMS = new CopyOnWriteArrayList<>();
     private static final List<String> CLASS_BLACKLIST = new ArrayList<>();
-    private static final List<String> CLASS_LOADING_LIST = new ArrayList<>();
-    private static final List<Class<?>> CLASS_LOADING_LIST_OBJECT = new ArrayList<>();
+    private static final List<String> CLASS_LOADING_LIST = Collections.synchronizedList(new ArrayList<>());
+    private static final List<Class<?>> CLASS_LOADING_LIST_OBJECT = new CopyOnWriteArrayList<>();
 
     static {
-        // 添加黑名单，避免加载核心类
-        CLASS_BLACKLIST.add("java.");
-        CLASS_BLACKLIST.add("javax.");
-        CLASS_BLACKLIST.add("sun.");
+        Collections.addAll(CLASS_BLACKLIST,
+                "java.", "javax.", "sun.", "com.sun.", "jdk.",
+                "org.xml.", "org.w3c.", "org.apache.",
+                "javax.management.", "javax.swing."
+        );
     }
 
     public BoxClassLoader(ClassLoader parent) {
         super(new URL[]{}, parent);
+        try {
+            PluginLoader.loadCorePlugin();
+        } catch (IOException e) {
+            throw new RuntimeException("Failed to load core plugin", e);
+        }
     }
 
     public BoxClassLoader(URL[] urls, ClassLoader parent) {
@@ -36,77 +45,56 @@ public class BoxClassLoader extends URLClassLoader {
         super.addURL(url);
     }
 
-    //@Override
-    //protected Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException {
-    //    synchronized (getClassLoadingLock(name)) {
-    //        // 1. 检查类是否已加载
-    //        Class<?> c = findLoadedClass(name);
-    //        if (c != null) {
-    //            return c;
-    //        }
-//
-    //        // 2. 检查黑名单
-    //        if (isBlacklisted(name)) {
-    //            return super.loadClass(name, resolve);
-    //        }
-//
-    //        // 3. 尝试自定义加载
-    //        try {
-    //            c = findClass(name);
-    //        } catch (ClassNotFoundException e) {
-    //            // 4. 自定义加载失败则委托给父加载器
-    //            c = super.loadClass(name, resolve);
-    //        }
-//
-    //        if (resolve) {
-    //            resolveClass(c);
-    //        }
-    //        return c;
-    //    }
-    //}
+    @Override
+    protected Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException {
+        synchronized (getClassLoadingLock(name)) {
+            Class<?> loadedClass = findLoadedClass(name);
+            if (loadedClass != null) return loadedClass;
+
+            if (isBlacklisted(name)) {
+                return getParent().loadClass(name);
+            }
+
+            try {
+                Class<?> c = findClass(name);
+                if (resolve) resolveClass(c);
+                return c;
+            } catch (ClassNotFoundException e) {
+                return super.loadClass(name, resolve);
+            }
+        }
+    }
 
     @Override
     protected Class<?> findClass(String name) throws ClassNotFoundException {
-        // 检查是否在黑名单中
-        if (isBlacklisted(name)) {
-            throw new ClassNotFoundException("Class is blacklisted: " + name);
-        }
+        synchronized (getClassLoadingLock(name)) {
+            if (CLASS_LOADING_LIST.contains(name)) {
+                throw new ClassCircularityError(name + " circular loading detected");
+            }
 
-        // 检查是否正在加载
-        if (CLASS_LOADING_LIST.contains(name)) {
-            throw new ClassNotFoundException("Class is already loading: " + name);
-        }
+            CLASS_LOADING_LIST.add(name);
+            try {
+                byte[] clazzByte = getClassBytes(name);
+                for (IClassTransformer transformer : CLASS_TRANSFORMS) {
+                    byte[] transformed = transformer.transform(name, transformer.getClass().getName(), clazzByte);
+                    if (transformed != null) clazzByte = transformed;
+                }
 
-        // 读取类字节码
-        byte[] clazzByte;
-        try {
-            clazzByte = getClassBytes(name);
-        } catch (IOException e) {
-            throw new ClassNotFoundException("Failed to load class bytes: " + name, e);
-        }
-
-        // 应用类转换器
-        for (IClassTransformer transformer : CLASS_TRANSFORMS) {
-            byte[] transformed = transformer.transform(name, transformer.getClass().getName(), clazzByte);
-            if (transformed != null) {
-                clazzByte = transformed;
+                Class<?> clazz = defineClass(name, clazzByte, 0, clazzByte.length);
+                CLASS_LOADING_LIST_OBJECT.add(clazz);
+                return clazz;
+            } catch (IOException e) {
+                throw new ClassNotFoundException("Class byte loading failed", e);
+            } finally {
+                CLASS_LOADING_LIST.remove(name);
             }
         }
-
-        // 定义类
-        CLASS_LOADING_LIST.add(name);
-        Class<?> clazz = defineClass(name, clazzByte, 0, clazzByte.length);
-        CLASS_LOADING_LIST_OBJECT.add(clazz);
-        return clazz;
     }
 
     private byte[] getClassBytes(String className) throws IOException, ClassNotFoundException {
         String path = className.replace('.', '/') + ".class";
-        URL classUrl = getResource(path);
-        if (classUrl == null) {
-            throw new ClassNotFoundException("Class not found: " + className);
-        }
-        try (InputStream is = classUrl.openStream()) {
+        try (InputStream is = getResourceAsStream(path)) {
+            if (is == null) throw new ClassNotFoundException(className);
             return is.readAllBytes();
         }
     }