diff --git a/pom.xml b/pom.xml
index 83926d4..13f7b38 100644
--- a/pom.xml
+++ b/pom.xml
@@ -6,7 +6,7 @@
 
   <groupId>cn.lunadeer</groupId>
   <artifactId>EssentialsD</artifactId>
-  <version>1.18.0</version>
+  <version>1.18.11</version>
   <packaging>jar</packaging>
 
   <name>EssentialsD</name>
diff --git a/src/main/java/cn/lunadeer/essentialsd/Events.java b/src/main/java/cn/lunadeer/essentialsd/Events.java
index 3542fc6..4120bd1 100644
--- a/src/main/java/cn/lunadeer/essentialsd/Events.java
+++ b/src/main/java/cn/lunadeer/essentialsd/Events.java
@@ -5,6 +5,8 @@ import cn.lunadeer.essentialsd.recipes.Crowbar;
 import cn.lunadeer.essentialsd.recipes.InvisibleGlowItemFrame;
 import cn.lunadeer.essentialsd.recipes.InvisibleItemFrame;
 import cn.lunadeer.essentialsd.utils.Notification;
+import cn.lunadeer.essentialsd.utils.XLogger;
+import org.bukkit.Location;
 import org.bukkit.Material;
 import org.bukkit.NamespacedKey;
 import org.bukkit.block.Block;
@@ -16,11 +18,13 @@ import org.bukkit.event.EventPriority;
 import org.bukkit.event.Listener;
 import org.bukkit.event.entity.EntityDamageByEntityEvent;
 import org.bukkit.event.entity.ExpBottleEvent;
+import org.bukkit.event.entity.PlayerDeathEvent;
 import org.bukkit.event.hanging.HangingBreakByEntityEvent;
 import org.bukkit.event.hanging.HangingPlaceEvent;
 import org.bukkit.event.inventory.InventoryClickEvent;
 import org.bukkit.event.player.PlayerInteractEntityEvent;
 import org.bukkit.event.player.PlayerInteractEvent;
+import org.bukkit.event.player.PlayerTeleportEvent;
 import org.bukkit.inventory.EquipmentSlot;
 import org.bukkit.inventory.Inventory;
 import org.bukkit.inventory.InventoryView;
@@ -192,4 +196,11 @@ public class Events implements Listener {
         }
         event.setExperience((int) (exp * EssentialsD.config.getExpBottleRatio()));
     }
+
+    // on player death update tpManager
+    @EventHandler(priority = EventPriority.HIGHEST)
+    public void onPlayerDeath(PlayerDeathEvent event) {
+        Player player = event.getEntity();
+        EssentialsD.tpManager.updateLastTpLocation(player);
+    }
 }
diff --git a/src/main/java/cn/lunadeer/essentialsd/TeleportManager.java b/src/main/java/cn/lunadeer/essentialsd/TeleportManager.java
index 550ef4d..1c38557 100644
--- a/src/main/java/cn/lunadeer/essentialsd/TeleportManager.java
+++ b/src/main/java/cn/lunadeer/essentialsd/TeleportManager.java
@@ -2,21 +2,26 @@ package cn.lunadeer.essentialsd;
 
 import cn.lunadeer.essentialsd.utils.Notification;
 import cn.lunadeer.essentialsd.utils.STUI.Button;
+import cn.lunadeer.essentialsd.utils.XLogger;
 import net.kyori.adventure.text.Component;
 import net.kyori.adventure.text.TextComponent;
 import net.kyori.adventure.text.format.TextColor;
+import org.bukkit.Location;
+import org.bukkit.World;
 import org.bukkit.entity.Player;
+import org.bukkit.event.player.PlayerTeleportEvent;
 
 import java.time.LocalDateTime;
-import java.util.Map;
 import java.util.UUID;
+import java.util.concurrent.ConcurrentHashMap;
 
 public class TeleportManager {
 
     private static final TextColor main_color = TextColor.color(0, 233, 255);
 
-    private final Map<UUID, TpTask> _tasks = new java.util.HashMap<>();
-    private final Map<UUID, LocalDateTime> _next_time_allow_tp = new java.util.HashMap<>();
+    private final ConcurrentHashMap<UUID, TpTask> _tasks = new ConcurrentHashMap<>();
+    private final ConcurrentHashMap<UUID, LocalDateTime> _next_time_allow_tp = new ConcurrentHashMap<>();
+    private final ConcurrentHashMap<UUID, Location> _last_tp_location = new ConcurrentHashMap<>();
 
     private static class TpTask {
         public Player initiator;
@@ -102,21 +107,64 @@ public class TeleportManager {
             return;
         }
         Notification.info(task.target, "已接受 " + task.initiator.getName() + " 的传送请求");
-        Notification.info(task.initiator, "玩家 " + task.target.getName() + " 已接受你的传送请求，传送将在 " + EssentialsD.config.getTpDelay() + " 秒后进行");
+        if (EssentialsD.config.getTpDelay() > 0) {
+            Notification.info(task.initiator, "玩家 " + task.target.getName() + " 已接受你的传送请求，传送将在 " + EssentialsD.config.getTpDelay() + " 秒后进行");
+        }
         EssentialsD.scheduler.global.runDelayed(EssentialsD.instance, (instance) -> {
             if (task.initiator.isOnline() && task.target.isOnline()) {
-                task.initiator.teleportAsync(task.target.getLocation());
+                doTeleportSafely(task.initiator, task.target.getLocation());
                 Notification.info(task.initiator, "已传送到 " + task.target.getName() + " 的位置");
                 Notification.info(task.target, "玩家 " + task.initiator.getName() + " 已传送到你的位置");
             }
-        }, EssentialsD.config.getTpDelay() == 0 ? 1 : 20L * EssentialsD.config.getTpDelay());
+        }, EssentialsD.config.getTpDelay() <= 0 ? 1 : 20L * EssentialsD.config.getTpDelay());
     }
 
     public void back(Player player) {
-        // todo: implement back teleport
+        if (!_last_tp_location.containsKey(player.getUniqueId())) {
+            Notification.error(player, "没有找到可返回的位置");
+            return;
+        }
+        if (EssentialsD.config.getTpDelay() > 0) {
+            Notification.info(player, "将在 " + EssentialsD.config.getTpDelay() + " 秒后返回上次传送的位置");
+        }
+        EssentialsD.scheduler.global.runDelayed(EssentialsD.instance, (instance) -> {
+            doTeleportSafely(player, _last_tp_location.get(player.getUniqueId()));
+            Notification.info(player, "已返回上次传送的位置");
+        }, EssentialsD.config.getTpDelay() <= 0 ? 1 : 20L * EssentialsD.config.getTpDelay());
     }
 
     public void rtp(Player player) {
-        // todo: implement rtp teleport
+        int radius = EssentialsD.config.getTpRtpRadius();
+        World world = player.getWorld();
+        int x = (int) (Math.random() * radius * 2) - radius;
+        int z = (int) (Math.random() * radius * 2) - radius;
+        XLogger.debug("RTP: " + x + " " + z);
+        Location location = new Location(world, x, player.getY(), z);
+        if (EssentialsD.config.getTpDelay() > 0) {
+            Notification.info(player, "将在 " + EssentialsD.config.getTpDelay() + " 秒后传送到随机位置");
+        }
+        EssentialsD.scheduler.global.runDelayed(EssentialsD.instance, (instance) -> {
+            doTeleportSafely(player, location);
+            Notification.info(player, "已传送到随机位置");
+        }, EssentialsD.config.getTpDelay() <= 0 ? 1 : 20L * EssentialsD.config.getTpDelay());
+    }
+
+    /**
+     * 把玩家传送到指定位置 并更新上次传送的位置
+     * 需要使用 schedule 传送
+     *
+     * @param player   玩家
+     * @param location 位置
+     */
+    private void doTeleportSafely(Player player, Location location) {
+        location.getWorld().getChunkAtAsyncUrgently(location).thenAccept((chunk) -> {
+            location.setY(chunk.getWorld().getHighestBlockYAt(location) + 1);
+            player.teleportAsync(location, PlayerTeleportEvent.TeleportCause.PLUGIN);
+            _last_tp_location.put(player.getUniqueId(), location);
+        });
+    }
+
+    public void updateLastTpLocation(Player player) {
+        _last_tp_location.put(player.getUniqueId(), player.getLocation());
     }
 }
diff --git a/src/main/java/cn/lunadeer/essentialsd/commands/Back.java b/src/main/java/cn/lunadeer/essentialsd/commands/Back.java
index 5174147..a0bbe76 100644
--- a/src/main/java/cn/lunadeer/essentialsd/commands/Back.java
+++ b/src/main/java/cn/lunadeer/essentialsd/commands/Back.java
@@ -1,6 +1,7 @@
 package cn.lunadeer.essentialsd.commands;
 
 import cn.lunadeer.essentialsd.EssentialsD;
+import cn.lunadeer.essentialsd.TeleportManager;
 import cn.lunadeer.essentialsd.utils.Notification;
 import org.bukkit.command.Command;
 import org.bukkit.command.CommandSender;
@@ -23,8 +24,7 @@ public class Back implements TabExecutor {
             return false;
         }
         Player player = (Player) sender;
-        // todo: implement this command
-        Notification.error(player, "这个命令还没有实现");
+        EssentialsD.tpManager.back(player);
         return true;
     }
 
diff --git a/src/main/java/cn/lunadeer/essentialsd/commands/Rtp.java b/src/main/java/cn/lunadeer/essentialsd/commands/Rtp.java
index 86765ad..3a11476 100644
--- a/src/main/java/cn/lunadeer/essentialsd/commands/Rtp.java
+++ b/src/main/java/cn/lunadeer/essentialsd/commands/Rtp.java
@@ -23,8 +23,7 @@ public class Rtp implements TabExecutor {
             return false;
         }
         Player player = (Player) sender;
-        // todo: implement this command
-        Notification.error(player, "这个命令还没有实现");
+        EssentialsD.tpManager.rtp(player);
         return true;
     }
 
diff --git a/src/main/resources/config.yml b/src/main/resources/config.yml
index 23671b0..357002d 100644
--- a/src/main/resources/config.yml
+++ b/src/main/resources/config.yml
@@ -2,7 +2,7 @@
 ExpBottleRatio: 1.0
 
 # 强加载区块列表
-ForceLoadChunks:
+ForceLoadChunks: []
 #  - world:0:0
 #  - world_the_end:-12:12
 
@@ -11,14 +11,14 @@ ForceLoadChunks:
 # -1 为禁用强加载区块操作
 ChunkOperateDelay: 10
 
-# 特殊合成表
+# 扩展合成表
 Recipes:
   CrowBar: true                 # 撬棍
   InvisibleItemFrame: true      # 隐形（发光）物品展示框
   LightBlock: true              # 光源方块
   StackedEnchantBook: true      # 附魔书堆叠
 
-# 特殊指令
+# 扩展指令
 Commands:
   EnderChest: true    # 快速末影箱
   Suicide: true       # 自杀
@@ -36,6 +36,7 @@ Teleport:
   TpaExpire: 30     # 传送请求有效期 秒
   RtpRadius: 1000   # 随机传送最大半径
 
+# 把楼梯当作椅子使用
 Chair:
   Enable: true
   MaxWidth: 4