diff --git a/README.md b/README.md
index 1716748f..28fdccd7 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
-# MoonLake [![GitHub version](https://d25lcipzij17d.cloudfront.net/badge.svg?id=gh&type=6&v=1.8-r3&x2=0)](https://github.com/u2g/MoonLake) [![Open Source Love](https://badges.frapsoft.com/os/v1/open-source.svg?v=102)](https://github.com/u2g/MoonLake) [![Open Source Love](https://badges.frapsoft.com/os/gpl/gpl.svg?v=102)](https://github.com/u2g/MoonLake)
+# MoonLake [![GitHub version](https://d25lcipzij17d.cloudfront.net/badge.svg?id=gh&type=6&v=1.8-a4&x2=0)](https://github.com/u2g/MoonLake) [![Open Source Love](https://badges.frapsoft.com/os/v1/open-source.svg?v=102)](https://github.com/u2g/MoonLake) [![Open Source Love](https://badges.frapsoft.com/os/gpl/gpl.svg?v=102)](https://github.com/u2g/MoonLake)
 
 Minecraft MoonLake Core API Plugin
-By Month_Light Ver: 1.8-r3
+By Month_Light Ver: 1.8-a4
 
 ## 简介
 这个插件提供了大量的 API 功能，实现了一些 Bukkit 无法做到的 NMS 功能<br />
diff --git a/config.yml b/config.yml
index 5b99c8a6..f785cf5b 100644
--- a/config.yml
+++ b/config.yml
@@ -1,14 +1,14 @@
 ################################
 #   MoonLake Core API Plugin   #
-#  By Month_Light Ver: 1.8-r3  #
+#  By Month_Light Ver: 1.8-a4  #
 ################################
 
 # 插件版本号: 此项请勿修改!
-version: '1.8-r3'
+version: '1.8-a4'
 
 # 数据包通道监听器
 # 此项可设置是否开启这个功能
 # 如果关闭则插件中的一些API功能将无法使用
 # 例如: MoonLakePlayerJoinEvent
 # PS: 此项是实时监听客户端与服务端的数据包交流
-PacketChannelListener: true
+PacketChannelListener: false
diff --git a/plugin.yml b/plugin.yml
index efb3bbed..90aedba1 100644
--- a/plugin.yml
+++ b/plugin.yml
@@ -1,9 +1,9 @@
 name: MoonLake
 main: com.minecraft.moonlake.MoonLakePlugin
-version: 1.8-r3
+version: 1.8-a4
 prefix: MoonLake
 description: Minecraft MoonLake Core API Plugin
 website: http://www.mcyszh.com/
 author: Month_Light
 authors: [Month_Light, MoonLake]
-softdepend: [MoonLakeEconomy, PermissionsEx, Vault]
\ No newline at end of file
+softdepend: [MoonLakeEconomy, PermissionsEx, Vault]
diff --git a/src/com/minecraft/moonlake/MoonLakePlugin.java b/src/com/minecraft/moonlake/MoonLakePlugin.java
index 03e29b78..bd93f508 100644
--- a/src/com/minecraft/moonlake/MoonLakePlugin.java
+++ b/src/com/minecraft/moonlake/MoonLakePlugin.java
@@ -33,7 +33,7 @@
  * <hr />
  * <div>
  *     <h1>Minecraft MoonLake Core API Plugin</h1>
- *     <p>By Month_Light Ver: 1.8-r3</p>
+ *     <p>By Month_Light Ver: 1.8-a4</p>
  *     <p>Website: <a href="http://www.mcyszh.com" target="_blank" style="text-decoration: none;">MoonLake Website</a></p>
  *     <p>QQ Group: 377607025 -> <a href="http://jq.qq.com/?_wv=1027&k=2IfPFrH" target="_blank">Jump</a></p>
  *     <hr />
@@ -42,7 +42,7 @@
  *         <ul>
  *             <li>Bukkit [1.8.x - 1.11.x] <span style="color: red">✔</span> 不完全支持</li>
  *             <li>Spigot [1.8.x - 1.11.x] <span style="color: rgb(85, 255, 85)">✔</span> 完完全全支持</li>
- *             <li>PaperSpigot [1.8.x - 1.11.x] <span style="color: rgb(85, 255, 85)"><s>✔</s></span> 完完全全支持</li>
+ *             <li>PaperSpigot [1.8.x - 1.11.x] <span style="color: rgb(85, 255, 85)">✔</span> 完完全全支持</li>
  *             <li>Cauldron | KCauldron [模组服务端] <span style="color: red">✘</span> 完全不支持</li>
  *         </ul>
  *     </div>
@@ -68,7 +68,7 @@
  *     <h1>修改操作请您遵守 <a href="https://github.com/u2g/MoonLake/blob/master/LICENSE" target="_blank">GPLv3</a> 协议，您必须公开修改过的所有代码！</h1>
  * </div>
  *
- * @version 1.8-r3
+ * @version 1.8-a4
  * @author Month_Light
  */
 public class MoonLakePlugin extends JavaPlugin implements MoonLake {
diff --git a/src/com/minecraft/moonlake/api/annotation/plugin/CommandAnnotationExpression.java b/src/com/minecraft/moonlake/api/annotation/plugin/CommandAnnotationExpression.java
index 4cccd04f..503fd1ad 100644
--- a/src/com/minecraft/moonlake/api/annotation/plugin/CommandAnnotationExpression.java
+++ b/src/com/minecraft/moonlake/api/annotation/plugin/CommandAnnotationExpression.java
@@ -26,6 +26,7 @@
 import java.lang.reflect.Method;
 import java.util.HashSet;
 import java.util.Set;
+import java.util.logging.Level;
 
 /**
  * <h1>CommandAnnotationExpression</h1>
@@ -49,12 +50,23 @@ public void load(Plugin plugin, Object obj) throws MoonLakeException {
         registerCommand(plugin, obj);
     }
 
+    @Override
+    public void load(Plugin plugin, MoonLakeCommand obj) throws MoonLakeException {
+
+        registerCommand(plugin, obj);
+    }
+
     @Override
     public Set<CommandAnnotated> registerCommand(Plugin plugin, Object obj) throws MoonLakeException {
 
         Validate.notNull(plugin, "The plugin object is null.");
         Validate.notNull(obj, "The obj object is null.");
 
+        if(!(obj instanceof MoonLakeCommand)) {
+            // warn new version need implements MoonLakeCommand
+            plugin.getLogger().log(Level.WARNING, "[MoonLake] 警告: 新版本核心插件命令类需要实现 MoonLakeCommand 接口. (请注意更新!)");
+        }
+
         Class<?> clazz = obj.getClass();
         Set<CommandAnnotated> commands = new HashSet<>();
         Set<Method> commandCompletionMethods = new HashSet<>();
@@ -98,4 +110,10 @@ public Set<CommandAnnotated> registerCommand(Plugin plugin, Object obj) throws M
         }
         return commands;
     }
+
+    @Override
+    public Set<CommandAnnotated> registerCommand(Plugin plugin, MoonLakeCommand obj) throws MoonLakeException {
+
+        return registerCommand(plugin, (Object) obj);
+    }
 }
diff --git a/src/com/minecraft/moonlake/api/annotation/plugin/command/CommandAnnotation.java b/src/com/minecraft/moonlake/api/annotation/plugin/command/CommandAnnotation.java
index 28b69ef7..b06f6e6d 100644
--- a/src/com/minecraft/moonlake/api/annotation/plugin/command/CommandAnnotation.java
+++ b/src/com/minecraft/moonlake/api/annotation/plugin/command/CommandAnnotation.java
@@ -34,6 +34,32 @@
  */
 public interface CommandAnnotation extends PluginAnnotation {
 
+    /**
+     * 将指定插件的指定对象加载数据
+     *
+     * @param plugin 插件
+     * @param obj 对象
+     * @throws IllegalArgumentException 如果插件对象为 {@code null} 则抛出异常
+     * @throws IllegalArgumentException 如果指定加载对象为 {@code null} 则抛出异常
+     * @throws MoonLakeException 如果加载错误则抛出异常
+     * @see #load(Plugin, MoonLakeCommand)
+     */
+    @Override
+    @Deprecated
+    void load(Plugin plugin, Object obj) throws MoonLakeException;
+
+    /**
+     * 将指定插件的指定对象加载数据
+     *
+     * @param plugin 插件
+     * @param obj 对象命令
+     * @throws IllegalArgumentException 如果插件对象为 {@code null} 则抛出异常
+     * @throws IllegalArgumentException 如果指定加载对象为 {@code null} 则抛出异常
+     * @throws MoonLakeException 如果加载错误则抛出异常
+     * @see #registerCommand(Plugin, MoonLakeCommand)
+     */
+    void load(Plugin plugin, MoonLakeCommand obj) throws MoonLakeException;
+
     /**
      * 将指定插件的指定对象注册命令
      *
@@ -43,6 +69,21 @@ public interface CommandAnnotation extends PluginAnnotation {
      * @throws IllegalArgumentException 如果插件对象为 {@code null} 则抛出异常
      * @throws IllegalArgumentException 如果指定加载对象为 {@code null} 则抛出异常
      * @throws MoonLakeException 如果注册错误则抛出异常
+     * @deprecated @deprecated 已过时, 将于 v2.0 删除. 请使用 {@link #registerCommand(Plugin, MoonLakeCommand)}
+     * @see #registerCommand(Plugin, MoonLakeCommand)
      */
+    @Deprecated
     Set<CommandAnnotated> registerCommand(Plugin plugin, Object obj) throws MoonLakeException;
+
+    /**
+     * 将指定插件的指定对象注册命令
+     *
+     * @param plugin 插件
+     * @param obj 对象命令
+     * @return 命令
+     * @throws IllegalArgumentException 如果插件对象为 {@code null} 则抛出异常
+     * @throws IllegalArgumentException 如果指定加载对象为 {@code null} 则抛出异常
+     * @throws MoonLakeException 如果注册错误则抛出异常
+     */
+    Set<CommandAnnotated> registerCommand(Plugin plugin, MoonLakeCommand obj) throws MoonLakeException;
 }
diff --git a/src/com/minecraft/moonlake/api/annotation/plugin/command/MoonLakeCommand.java b/src/com/minecraft/moonlake/api/annotation/plugin/command/MoonLakeCommand.java
new file mode 100644
index 00000000..694d8ded
--- /dev/null
+++ b/src/com/minecraft/moonlake/api/annotation/plugin/command/MoonLakeCommand.java
@@ -0,0 +1,30 @@
+/*
+ * Copyright (C) 2016 The MoonLake Authors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+
+package com.minecraft.moonlake.api.annotation.plugin.command;
+
+/**
+ * <h1>MoonLakeCommand</h1>
+ * 月色之湖命令接口类（详细doc待补充...）
+ *
+ * @version 1.0
+ * @author Month_Light
+ * @see CommandAnnotated
+ */
+public interface MoonLakeCommand {
+}
diff --git a/src/com/minecraft/moonlake/manager/ItemManager.java b/src/com/minecraft/moonlake/manager/ItemManager.java
index afaf44ea..0eafe03d 100644
--- a/src/com/minecraft/moonlake/manager/ItemManager.java
+++ b/src/com/minecraft/moonlake/manager/ItemManager.java
@@ -18,22 +18,30 @@
  
 package com.minecraft.moonlake.manager;
 
+import com.minecraft.moonlake.MoonLakeAPI;
+import com.minecraft.moonlake.api.item.AttributeModify;
+import com.minecraft.moonlake.api.item.ItemBuilder;
 import com.minecraft.moonlake.api.nbt.NBTCompound;
 import com.minecraft.moonlake.api.nbt.NBTFactory;
+import com.minecraft.moonlake.data.Conversions;
 import com.minecraft.moonlake.data.NBTTagData;
 import com.minecraft.moonlake.data.NBTTagDataWrapped;
 import com.minecraft.moonlake.exception.MoonLakeException;
+import com.minecraft.moonlake.util.StringUtil;
 import com.minecraft.moonlake.validate.Validate;
 import org.bukkit.Material;
+import org.bukkit.configuration.ConfigurationSection;
+import org.bukkit.configuration.file.YamlConfiguration;
+import org.bukkit.enchantments.Enchantment;
+import org.bukkit.inventory.ItemFlag;
 import org.bukkit.inventory.ItemStack;
 
-import java.io.ByteArrayInputStream;
-import java.io.ByteArrayOutputStream;
-import java.io.InputStream;
-import java.io.OutputStream;
+import java.io.*;
 import java.lang.reflect.Constructor;
 import java.lang.reflect.Method;
 import java.util.Base64;
+import java.util.List;
+import java.util.Set;
 
 import static com.minecraft.moonlake.reflect.Reflect.*;
 
@@ -454,4 +462,233 @@ public static ItemStack deserialize(String data) {
         }
         return null;
     }
+
+    /** Serialize ItemStack To File */
+    public static File serializeToFile(ItemBuilder builder) {
+
+        Validate.notNull(builder, "The item builder object is null.");
+
+        return serializeToFile(builder.build(true));
+    }
+
+    public static File serializeToFile(ItemStack itemStack) {
+
+        throw new UnsupportedOperationException();
+    }
+    /** Serialize ItemStack To File */
+
+    /**
+     * 将特定 YAML 文件数据反序列化为物品栈对象
+     *
+     * @param path 文件路径
+     * @return 物品栈对象 异常返回 null
+     * @throws IllegalArgumentException 如果路径对象为 {@code null} 则抛出异常
+     * @throws IllegalArgumentException 如果文件对象为 {@code null} 则抛出异常
+     * @throws IllegalArgumentException 如果文件对象不存在或不是文件则抛出异常
+     * @throws IllegalArgumentException 如果文件对象后缀类型名不为 {@code yml} 则抛出异常
+     * @throws MoonLakeException 如果反序列化错误则抛出异常
+     */
+    public static ItemStack deserializeFromFile(String path) {
+
+        Validate.notNull(path, "The file path object is null.");
+
+        return deserializeFromFile(new File(path));
+    }
+
+    /**
+     * 将特定 YAML 文件数据反序列化为物品栈对象
+     *
+     * <p>By Month_Light Ver: 1.0</p>
+     *
+     * @param file 文件
+     * @return 物品栈对象 异常返回 null
+     * @throws IllegalArgumentException 如果文件对象为 {@code null} 则抛出异常
+     * @throws IllegalArgumentException 如果文件对象不存在或不是文件则抛出异常
+     * @throws IllegalArgumentException 如果文件对象后缀类型名不为 {@code yml} 则抛出异常
+     * @throws MoonLakeException 如果反序列化错误则抛出异常
+     */
+    public static ItemStack deserializeFromFile(File file) {
+
+        Validate.notNull(file, "The file object is null.");
+        Validate.isTrue(file.exists() && file.isFile(), "The file not exists or not file.");
+        Validate.isTrue(file.getName().endsWith(".yml"), "The file not is yml suffix.");
+
+        YamlConfiguration yml = YamlConfiguration.loadConfiguration(file);
+        ItemBuilder itemBuilder = null;
+
+        if(!yml.isSet("Type"))
+            throw new MoonLakeException("The yml file not exists 'Type' attribute.");
+
+        String type = yml.getString("Type");
+        Material material = Material.matchMaterial(type);
+
+        if(material == null)
+            throw new MoonLakeException("The yml file 'Type' attribute is unknown material: " + type);
+
+        if(material == Material.AIR)
+            return new ItemStack(Material.AIR);
+
+        // base
+        int data = yml.isSet("Data") ? yml.getInt("Data", 0) : 0;
+        int amount = yml.isSet("Amount") ? yml.getInt("Amount", 1) : 1;
+
+        // init
+        itemBuilder = MoonLakeAPI.newItemBuilder(material, data, amount);
+
+        // displayName
+        String displayName = yml.isSet("DisplayName") ? yml.getString("DisplayName", null) : null;
+
+        if(displayName != null)
+            itemBuilder.setDisplayName(displayName);
+
+        // lore
+        List<String> lore = yml.isSet("Lore") ? yml.getStringList("Lore") : null;
+
+        if(lore != null)
+            itemBuilder.setLore(StringUtil.toColor(lore));
+
+        // enchantment
+        if(yml.isSet("Enchantment")) {
+
+            ConfigurationSection section = yml.getConfigurationSection("Enchantment");
+            Set<String> keys = section != null ? section.getKeys(false) : null;
+
+            if(keys != null && !keys.isEmpty()) {
+
+                for(final String key : keys) {
+
+                    Enchantment enchantment = null;
+                    int level = yml.getInt("Enchantment." + key);
+
+                    if(key.matches("([0-9])+"))
+                        enchantment = Enchantment.getById(Conversions.toInt(key));
+                    else
+                        enchantment = Enchantment.getByName(key.toUpperCase());
+
+                    if(enchantment == null)
+                        MoonLakeAPI.getMLogger().error("The deserialize from file '" + file.getName() + "' key 'Enchantment' error enchantment: " + key);
+                    else
+                        itemBuilder.addEnchantment(enchantment, level);
+                }
+            }
+        }
+
+        // hide flag
+        if(yml.isSet("HideFlag")) {
+
+            List<String> list = yml.getStringList("HideFlag");
+
+            if(list != null && !list.isEmpty()) {
+
+                for(final String hideFlag : list) {
+
+                    ItemFlag itemFlag = null;
+
+                    try {
+
+                        itemFlag = ItemFlag.valueOf(hideFlag.toUpperCase());
+                    }
+                    catch (Exception e) {
+                    }
+
+                    if(itemFlag == null)
+                        MoonLakeAPI.getMLogger().error("The deserialize from file '" + file.getName() + "' key 'HideFlag' error flag: " + hideFlag);
+                    else
+                        itemBuilder.addFlags(itemFlag);
+                }
+            }
+        }
+
+        // unbreakable
+        if(yml.isSet("Unbreakable")) {
+
+            boolean result = yml.getBoolean("Unbreakable", false);
+
+            if(result)
+                itemBuilder.setUnbreakable(true);
+        }
+
+        // attribute modifiers
+        if(yml.isSet("AttributeModifiers")) {
+
+            ConfigurationSection section = yml.getConfigurationSection("AttributeModifiers");
+            Set<String> keys = section != null ? section.getKeys(false) : null;
+
+            if(keys != null && !keys.isEmpty()) {
+
+                for(final String key : keys) {
+
+                    AttributeModify.Type attType = AttributeModify.Type.fromType(key);
+
+                    if(attType == null) {
+
+                        MoonLakeAPI.getMLogger().error("The deserialize from file '" + file.getName() + "' key 'AttributeModifiers' error type: " + key);
+                        continue;
+                    }
+                    double value = yml.getDouble("AttributeModifiers." + key + ".Value", -1d);
+                    boolean percent = yml.getBoolean("AttributeModifiers." + key + ".Percent", false);
+                    String slot = yml.getString("AttributeModifiers." + key + ".Slot", null);
+                    AttributeModify.Slot slotObj = slot != null ? AttributeModify.Slot.fromType(slot) : AttributeModify.Slot.MAIN_HAND;
+                    // add
+                    itemBuilder.setAttribute(new AttributeModify(
+                            attType,
+                            slotObj,
+                            percent ? AttributeModify.Operation.ADD_PERCENTAGE : AttributeModify.Operation.ADD_NUMBER,
+                            value
+                    ));
+                }
+            }
+        }
+
+        // nbt modifiers
+        ItemStack result = itemBuilder.build(true);
+        NBTCompound tag = MoonLakeAPI.getNBTLibrary().read(result);
+
+        // skull owner
+        if(yml.isSet("SkullOwner")) {
+
+            if(material == Material.SKULL_ITEM) {
+
+                String target = yml.getString("SkullOwner", null);
+
+                if(target != null && !target.isEmpty())
+                    tag.put("SkullOwner", target);
+            }
+        }
+
+        // age
+        if(yml.isSet("Age")) {
+
+            int age = yml.getInt("Age", 6000);
+
+            if(age != 6000)
+                tag.put("Age", age);
+        }
+
+        // pickup delay
+        if(yml.isSet("PickupDelay")) {
+
+            int pickupDelay = yml.getInt("PickupDelay", -1);
+
+            if(pickupDelay != -1)
+                tag.put("PickupDelay", pickupDelay);
+        }
+
+        // generation
+        /*if(yml.isSet("Generation")) {
+
+            if(material == Material.WRITTEN_BOOK) {
+
+                int value = yml.getInt("Generation", -1);
+
+                if(value != -1)
+                    tag.put("generation", value);
+            }
+        }*/
+
+        // write nbt
+        MoonLakeAPI.getNBTLibrary().write(result, tag);
+
+        return result;
+    }
 }
diff --git a/src/com/minecraft/moonlake/nms/packet/PacketPlayOutRespawn.java b/src/com/minecraft/moonlake/nms/packet/PacketPlayOutRespawn.java
index cbdeadea..1f6ca047 100644
--- a/src/com/minecraft/moonlake/nms/packet/PacketPlayOutRespawn.java
+++ b/src/com/minecraft/moonlake/nms/packet/PacketPlayOutRespawn.java
@@ -57,10 +57,12 @@ public class PacketPlayOutRespawn extends PacketAbstract<PacketPlayOutRespawn> {
 
         try {
 
+            String enumGamemode = getServerVersion().equals("v1_8_R1") || getServerVersionNumber() >= 10 ? "EnumGamemode" : "WorldSettings$EnumGamemode";
+
             CLASS_PACKETPLAYOUTRESPAWN = PackageType.MINECRAFT_SERVER.getClass("PacketPlayOutRespawn");
             CLASS_WORLDTYPE = PackageType.MINECRAFT_SERVER.getClass("WorldType");
             CLASS_ENUMDIFFICULTY = PackageType.MINECRAFT_SERVER.getClass("EnumDifficulty");
-            CLASS_ENUMGAMEMODE = PackageType.MINECRAFT_SERVER.getClass("EnumGamemode");
+            CLASS_ENUMGAMEMODE = PackageType.MINECRAFT_SERVER.getClass(enumGamemode);
             CLASS_WORLD = PackageType.MINECRAFT_SERVER.getClass("World");
             CLASS_WORLDPROVIDER = PackageType.MINECRAFT_SERVER.getClass("WorldProvider");
             CLASS_ENTITY = PackageType.MINECRAFT_SERVER.getClass("Entity");