diff --git a/hamster-core-bukkit/src/main/java/cn/hamster3/mc/plugin/core/bukkit/command/core/EnvCommand.java b/hamster-core-bukkit/src/main/java/cn/hamster3/mc/plugin/core/bukkit/command/core/EnvCommand.java
new file mode 100644
index 0000000..e163e44
--- /dev/null
+++ b/hamster-core-bukkit/src/main/java/cn/hamster3/mc/plugin/core/bukkit/command/core/EnvCommand.java
@@ -0,0 +1,51 @@
+package cn.hamster3.mc.plugin.core.bukkit.command.core;
+
+import cn.hamster3.mc.plugin.core.bukkit.command.ChildCommand;
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandSender;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.Collections;
+import java.util.List;
+
+public class EnvCommand extends ChildCommand {
+    public static final EnvCommand INSTANCE = new EnvCommand();
+
+    private EnvCommand() {
+    }
+
+    @Override
+    public @NotNull String getName() {
+        return "env";
+    }
+
+    @Override
+    public @NotNull String getUsage() {
+        return "env [变量名]";
+    }
+
+    @Override
+    public boolean hasPermission(@NotNull CommandSender sender) {
+        return true;
+    }
+
+    @Override
+    public @NotNull String getDescription() {
+        return "获取系统环境变量";
+    }
+
+    @Override
+    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, String[] args) {
+        if (args.length < 1) {
+            sender.sendMessage(System.getenv().toString());
+            return true;
+        }
+        sender.sendMessage(args[0] + "=" + System.getenv().getOrDefault(args[0], ""));
+        return true;
+    }
+
+    @Override
+    public List<String> onTabComplete(@NotNull CommandSender sender, @NotNull Command command, @NotNull String alias, String[] args) {
+        return Collections.emptyList();
+    }
+}
diff --git a/hamster-core-bukkit/src/main/java/cn/hamster3/mc/plugin/core/bukkit/command/core/ParentCoreCommand.java b/hamster-core-bukkit/src/main/java/cn/hamster3/mc/plugin/core/bukkit/command/core/ParentCoreCommand.java
index 1f92a8c..655cf3d 100644
--- a/hamster-core-bukkit/src/main/java/cn/hamster3/mc/plugin/core/bukkit/command/core/ParentCoreCommand.java
+++ b/hamster-core-bukkit/src/main/java/cn/hamster3/mc/plugin/core/bukkit/command/core/ParentCoreCommand.java
@@ -8,6 +8,7 @@ public class ParentCoreCommand extends ParentCommand {
 
     private ParentCoreCommand() {
         super(HamsterCorePlugin.getInstance(), "core");
+        addChildCommand(EnvCommand.INSTANCE);
         addChildCommand(GCCommand.INSTANCE);
         addChildCommand(YamlCommand.INSTANCE);
         addChildCommand(InfoModeCommand.INSTANCE);
diff --git a/hamster-core-bukkit/src/main/java/cn/hamster3/mc/plugin/core/bukkit/page/PageElement.java b/hamster-core-bukkit/src/main/java/cn/hamster3/mc/plugin/core/bukkit/page/PageElement.java
index 062780d..2ffe534 100644
--- a/hamster-core-bukkit/src/main/java/cn/hamster3/mc/plugin/core/bukkit/page/PageElement.java
+++ b/hamster-core-bukkit/src/main/java/cn/hamster3/mc/plugin/core/bukkit/page/PageElement.java
@@ -1,133 +1,20 @@
 package cn.hamster3.mc.plugin.core.bukkit.page;
 
-import org.bukkit.Material;
 import org.bukkit.entity.HumanEntity;
 import org.bukkit.inventory.ItemStack;
-import org.bukkit.inventory.meta.ItemMeta;
+import org.jetbrains.annotations.NotNull;
 
-import java.util.HashMap;
-import java.util.List;
 import java.util.Map;
 
 @SuppressWarnings("unused")
 public interface PageElement {
-
-    /**
-     * 获取展示物品
-     * <p>
-     * 若返回 null 则使用 config 中的全局设置值
-     *
-     * @param player 占位符显示的目标玩家
-     * @return 展示物品
-     */
-    default ItemStack getDisplayItem(HumanEntity player) {
-        return null;
+    @NotNull
+    default ItemStack getDisplayItem(@NotNull HumanEntity player, @NotNull ItemStack defaultItem, @NotNull Map<String, String> pageVariables) {
+        return defaultItem.clone();
     }
 
-    /**
-     * 获取展示物品的显示材质
-     * <p>
-     * 若返回 null 则使用 config 中的全局设置值
-     *
-     * @param player 占位符显示的目标玩家
-     * @return 展示物品的显示材质
-     */
-    default Material getMaterial(HumanEntity player) {
-        return null;
-    }
-
-    /**
-     * 替换物品的信息
-     *
-     * @param player         玩家
-     * @param stack          物品
-     * @param globalVariable 全局变量
-     */
-    default void replaceItemInfo(HumanEntity player, ItemStack stack, HashMap<String, String> globalVariable) {
-        if (stack == null) {
-            return;
-        }
-        Material type = getMaterial(player);
-        if (type != null) {
-            stack.setType(type);
-        }
-
-        ItemMeta meta = stack.getItemMeta();
-        replaceMetaInfo(player, meta, globalVariable);
-        stack.setItemMeta(meta);
-    }
-
-    /**
-     * 替换物品的信息
-     *
-     * @param player         玩家
-     * @param meta           物品信息
-     * @param globalVariable 全局变量
-     */
-    default void replaceMetaInfo(HumanEntity player, ItemMeta meta, HashMap<String, String> globalVariable) {
-        if (meta == null) {
-            return;
-        }
-
-        Map<String, String> replacer = getVariable(player, globalVariable);
-
-        if (meta.hasDisplayName()) {
-            String displayName = replaceDisplayName(player, meta.getDisplayName(), globalVariable);
-            meta.setDisplayName(displayName);
-        }
-
-        List<String> lore = meta.getLore();
-        if (lore != null) {
-            lore = replaceLore(player, lore, globalVariable);
-            meta.setLore(lore);
-        }
-    }
-
-    /**
-     * 替换物品展示名称
-     *
-     * @param player         玩家
-     * @param displayName    物品原名称
-     * @param globalVariable 全局变量
-     * @return 替换后的物品展示名称
-     */
-    default String replaceDisplayName(HumanEntity player, String displayName, HashMap<String, String> globalVariable) {
-        return replacePlaceholder(player, displayName, globalVariable);
-    }
-
-    /**
-     * 替换物品 lore 信息
-     *
-     * @param player         玩家
-     * @param lore           物品原 lore 信息
-     * @param globalReplacer 全局变量
-     * @return 替换后的物品 lore 信息
-     */
-    default List<String> replaceLore(HumanEntity player, List<String> lore, HashMap<String, String> globalReplacer) {
-        if (lore == null) {
-            return null;
-        }
-        Map<String, String> replacer = getVariable(player, globalReplacer);
-        for (int i = 0; i < lore.size(); i++) {
-            String s = lore.get(i);
-            for (Map.Entry<String, String> entry : replacer.entrySet()) {
-                s = s.replace(entry.getKey(), entry.getValue());
-            }
-            lore.set(i, s);
-        }
-        return lore;
-    }
-
-    default String replacePlaceholder(HumanEntity player, String string, HashMap<String, String> globalVariable) {
-        Map<String, String> replacer = getVariable(player, globalVariable);
-        for (Map.Entry<String, String> entry : replacer.entrySet()) {
-            string = string.replace(entry.getKey(), entry.getValue());
-        }
-        return string;
-    }
-
-    default Map<String, String> getVariable(HumanEntity player, HashMap<String, String> globalVariable) {
-        return globalVariable;
+    default Map<String, String> getVariables(@NotNull HumanEntity player, @NotNull Map<String, String> pageVariables) {
+        return pageVariables;
     }
 
 }
diff --git a/hamster-core-bukkit/src/main/java/cn/hamster3/mc/plugin/core/bukkit/page/PageManager.java b/hamster-core-bukkit/src/main/java/cn/hamster3/mc/plugin/core/bukkit/page/PageManager.java
index b6d708f..00c5efe 100644
--- a/hamster-core-bukkit/src/main/java/cn/hamster3/mc/plugin/core/bukkit/page/PageManager.java
+++ b/hamster-core-bukkit/src/main/java/cn/hamster3/mc/plugin/core/bukkit/page/PageManager.java
@@ -56,5 +56,4 @@ public class PageManager {
         PAGE_CONFIG.put(clazz.getName(), pageConfig);
         return pageConfig;
     }
-
 }
diff --git a/hamster-core-bukkit/src/main/java/cn/hamster3/mc/plugin/core/bukkit/page/handler/FixedPageHandler.java b/hamster-core-bukkit/src/main/java/cn/hamster3/mc/plugin/core/bukkit/page/handler/FixedPageHandler.java
index 0cf81a0..f5eefd3 100644
--- a/hamster-core-bukkit/src/main/java/cn/hamster3/mc/plugin/core/bukkit/page/handler/FixedPageHandler.java
+++ b/hamster-core-bukkit/src/main/java/cn/hamster3/mc/plugin/core/bukkit/page/handler/FixedPageHandler.java
@@ -2,8 +2,8 @@ package cn.hamster3.mc.plugin.core.bukkit.page.handler;
 
 import cn.hamster3.mc.plugin.core.bukkit.page.ButtonGroup;
 import cn.hamster3.mc.plugin.core.bukkit.page.PageConfig;
+import org.bukkit.Bukkit;
 import org.bukkit.entity.HumanEntity;
-import org.bukkit.inventory.Inventory;
 import org.jetbrains.annotations.NotNull;
 
 import java.util.List;
@@ -23,9 +23,11 @@ public class FixedPageHandler extends PageHandler {
 
     @Override
     public void initPage() {
+        if (inventory == null) {
+            inventory = Bukkit.createInventory(this, getConfig().getInventory().getSize(), getTitle());
+        }
         HumanEntity player = getPlayer();
 
-        Inventory inventory = getInventory();
         PageConfig config = getConfig();
         ButtonGroup group = getButtonGroup();
 
diff --git a/hamster-core-bukkit/src/main/java/cn/hamster3/mc/plugin/core/bukkit/page/handler/PageHandler.java b/hamster-core-bukkit/src/main/java/cn/hamster3/mc/plugin/core/bukkit/page/handler/PageHandler.java
index 7652733..5d36a2c 100644
--- a/hamster-core-bukkit/src/main/java/cn/hamster3/mc/plugin/core/bukkit/page/handler/PageHandler.java
+++ b/hamster-core-bukkit/src/main/java/cn/hamster3/mc/plugin/core/bukkit/page/handler/PageHandler.java
@@ -4,7 +4,6 @@ import cn.hamster3.mc.plugin.core.bukkit.HamsterCorePlugin;
 import cn.hamster3.mc.plugin.core.bukkit.page.ButtonGroup;
 import cn.hamster3.mc.plugin.core.bukkit.page.PageConfig;
 import cn.hamster3.mc.plugin.core.bukkit.page.PageManager;
-import org.bukkit.Bukkit;
 import org.bukkit.Sound;
 import org.bukkit.entity.HumanEntity;
 import org.bukkit.entity.Player;
@@ -20,7 +19,7 @@ import org.jetbrains.annotations.NotNull;
 public abstract class PageHandler implements InventoryHolder {
     private final PageConfig config;
     private final HumanEntity player;
-    private final Inventory inventory;
+    protected Inventory inventory;
 
     public PageHandler(@NotNull HumanEntity player) {
         try {
@@ -29,13 +28,11 @@ public abstract class PageHandler implements InventoryHolder {
             throw new IllegalArgumentException("加载界面配置时遇到了一个异常!", e);
         }
         this.player = player;
-        inventory = Bukkit.createInventory(this, config.getInventory().getSize(), getTitle());
     }
 
     public PageHandler(@NotNull PageConfig config, @NotNull HumanEntity player) {
         this.config = config;
         this.player = player;
-        inventory = Bukkit.createInventory(this, config.getInventory().getSize(), getTitle());
     }
 
     public abstract void initPage();
diff --git a/hamster-core-bukkit/src/main/java/cn/hamster3/mc/plugin/core/bukkit/page/handler/PageableHandler.java b/hamster-core-bukkit/src/main/java/cn/hamster3/mc/plugin/core/bukkit/page/handler/PageableHandler.java
index 98eb92d..1c58726 100644
--- a/hamster-core-bukkit/src/main/java/cn/hamster3/mc/plugin/core/bukkit/page/handler/PageableHandler.java
+++ b/hamster-core-bukkit/src/main/java/cn/hamster3/mc/plugin/core/bukkit/page/handler/PageableHandler.java
@@ -3,6 +3,7 @@ package cn.hamster3.mc.plugin.core.bukkit.page.handler;
 import cn.hamster3.mc.plugin.core.bukkit.page.ButtonGroup;
 import cn.hamster3.mc.plugin.core.bukkit.page.PageConfig;
 import cn.hamster3.mc.plugin.core.bukkit.page.PageElement;
+import org.bukkit.Material;
 import org.bukkit.entity.HumanEntity;
 import org.bukkit.event.inventory.ClickType;
 import org.bukkit.event.inventory.InventoryAction;
@@ -14,6 +15,7 @@ import org.jetbrains.annotations.NotNull;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
+import java.util.Map;
 
 /**
  * 支持翻页的 GUI
@@ -22,6 +24,8 @@ import java.util.List;
  */
 @SuppressWarnings("unused")
 public abstract class PageableHandler<E extends PageElement> extends FixedPageHandler {
+    private static final ItemStack EMPTY_STACK = new ItemStack(Material.AIR);
+
     private String previewButtonName = "preview";
     private String nextButtonName = "next";
     private String barrierButtonName = "barrier";
@@ -50,67 +54,6 @@ public abstract class PageableHandler<E extends PageElement> extends FixedPageHa
         return elementButtonName;
     }
 
-    public void initElementButton(@NotNull E element, @NotNull ItemStack displayItem, HashMap<String, String> replacer) {
-        element.replaceItemInfo(getPlayer(), displayItem, replacer);
-    }
-
-    @Override
-    public void initPage() {
-        super.initPage();
-        List<E> elements = getPageElements();
-        ButtonGroup group = getButtonGroup();
-        Inventory inventory = getInventory();
-        HumanEntity player = getPlayer();
-
-        ArrayList<Integer> buttonIndexes = group.getButtonAllIndex(elementButtonName);
-        int pageSize = buttonIndexes.size(); // 一页有多少个按钮
-        elementSlot = new HashMap<>();
-
-        HashMap<String, String> replacer = getReplacer();
-
-        for (int i = 0; i < pageSize; i++) {
-            // 元素在当前 page 中的索引位置
-            int elementIndex = page * pageSize + i;
-            // 按钮在 GUI 中的索引位置
-            int buttonIndex = buttonIndexes.get(i);
-
-            if (elementIndex >= elements.size()) {
-                inventory.setItem(buttonIndex, null);
-                continue;
-            }
-
-            E element = elements.get(elementIndex);
-            elementSlot.put(buttonIndex, element);
-
-            ItemStack elementDisplayItem = element.getDisplayItem(player);
-            if (elementDisplayItem != null) {
-                elementDisplayItem = elementDisplayItem.clone();
-                element.replaceItemInfo(player, elementDisplayItem, replacer);
-                inventory.setItem(buttonIndex, elementDisplayItem);
-                continue;
-            }
-
-            ItemStack button = group.getButton(getElementButtonName(element));
-            if (button == null) {
-                inventory.setItem(buttonIndex, null);
-                continue;
-            }
-
-            ItemStack elementItem = button.clone();
-            initElementButton(element, elementItem, replacer);
-            inventory.setItem(buttonIndex, elementItem);
-        }
-
-        if (page == 0) {
-            // 如果页面已在首页则撤掉上一页按钮
-            inventory.setItem(group.getButtonIndex(previewButtonName), group.getButton(barrierButtonName));
-        }
-        if (elements.size() <= (page + 1) * pageSize) {
-            // 如果页面显示超出已有元素数量则撤掉下一页按钮
-            inventory.setItem(group.getButtonIndex(nextButtonName), group.getButton(barrierButtonName));
-        }
-    }
-
     @Override
     public void onClickInside(@NotNull InventoryClickEvent event) {
         event.setCancelled(true);
@@ -130,6 +73,53 @@ public abstract class PageableHandler<E extends PageElement> extends FixedPageHa
         }
     }
 
+    @Override
+    public void initPage() {
+        super.initPage();
+        List<E> elements = getPageElements();
+        ButtonGroup group = getButtonGroup();
+        Inventory inventory = getInventory();
+        HumanEntity player = getPlayer();
+
+        ArrayList<Integer> buttonIndexes = group.getButtonAllIndex(elementButtonName);
+        int pageSize = buttonIndexes.size(); // 一页有多少个按钮
+        elementSlot = new HashMap<>();
+
+        HashMap<String, String> variables = getVariables();
+
+        for (int i = 0; i < pageSize; i++) {
+            // 元素在当前 page 中的索引位置
+            int elementIndex = page * pageSize + i;
+            // 按钮在 GUI 中的索引位置
+            int buttonIndex = buttonIndexes.get(i);
+
+            if (elementIndex >= elements.size()) {
+                inventory.setItem(buttonIndex, null);
+                continue;
+            }
+
+            E element = elements.get(elementIndex);
+            elementSlot.put(buttonIndex, element);
+
+            ItemStack button = group.getButton(getElementButtonName(element));
+            ItemStack displayItem = element.getDisplayItem(player, button == null ? EMPTY_STACK : button, variables);
+            initElementButton(element, displayItem, variables);
+            inventory.setItem(buttonIndex, displayItem);
+        }
+
+        if (page == 0) {
+            // 如果页面已在首页则撤掉上一页按钮
+            inventory.setItem(group.getButtonIndex(previewButtonName), group.getButton(barrierButtonName));
+        }
+        if (elements.size() <= (page + 1) * pageSize) {
+            // 如果页面显示超出已有元素数量则撤掉下一页按钮
+            inventory.setItem(group.getButtonIndex(nextButtonName), group.getButton(barrierButtonName));
+        }
+    }
+
+    public void initElementButton(@NotNull E element, @NotNull ItemStack displayItem, @NotNull Map<String, String> variables) {
+    }
+
     public void showPreviewPage() {
         page--;
         show();
@@ -169,7 +159,8 @@ public abstract class PageableHandler<E extends PageElement> extends FixedPageHa
         this.elementButtonName = elementButtonName;
     }
 
-    public HashMap<String, String> getReplacer() {
+    @NotNull
+    public HashMap<String, String> getVariables() {
         return new HashMap<>();
     }
 }