diff --git a/server/gameserver/building.cc b/server/gameserver/building.cc
index 5385478..5876de0 100644
--- a/server/gameserver/building.cc
+++ b/server/gameserver/building.cc
@@ -17,6 +17,7 @@ Building::~Building()
 
 void Building::Initialize()
 {
+    Entity::Initialize();
     RecalcSelfCollider();
 }
 
diff --git a/server/gameserver/bullet.cc b/server/gameserver/bullet.cc
index 2997c0d..ee5640a 100644
--- a/server/gameserver/bullet.cc
+++ b/server/gameserver/bullet.cc
@@ -18,6 +18,7 @@ Bullet::~Bullet()
 
 void Bullet::Initialize()
 {
+    Entity::Initialize();
     RecalcSelfCollider();
 }
 
diff --git a/server/gameserver/constant.h b/server/gameserver/constant.h
index 56f5212..c0fd1e3 100755
--- a/server/gameserver/constant.h
+++ b/server/gameserver/constant.h
@@ -75,6 +75,7 @@ enum InventorySlot_e
     IS_FRAG  = 5,
     IS_SMOKE  = 6,
     IS_HEALTHKIT  = 7,
+    IS_PAIN_KILLER  = 8,
 
     IS_1XSCOPE  = 12,
     IS_2XSCOPE  = 13,
diff --git a/server/gameserver/entity.cc b/server/gameserver/entity.cc
index ee81e80..f63e218 100644
--- a/server/gameserver/entity.cc
+++ b/server/gameserver/entity.cc
@@ -2,12 +2,23 @@
 
 #include "entity.h"
 #include "collider.h"
+#include "room.h"
+
+Entity::Entity()
+{
+
+}
 
 Entity::~Entity()
 {
     ClearColliders();
 }
 
+void Entity::Initialize()
+{
+    xtimer_attacher.xtimer = &room->xtimer;
+}
+
 bool Entity::TestCollision(Entity* b)
 {
     for (auto& a_collider : colliders) {
diff --git a/server/gameserver/entity.h b/server/gameserver/entity.h
index b922147..617a5db 100644
--- a/server/gameserver/entity.h
+++ b/server/gameserver/entity.h
@@ -46,12 +46,13 @@ class Entity
     int updated_times = 0;
     std::list<ColliderComponent*> colliders;
     bool deleted = false;
+    a8::XTimerAttacher xtimer_attacher;
 
     Obstacle* last_collision_door = nullptr;
 
-    Entity() {};
+    Entity();
     virtual ~Entity();
-    virtual void Initialize() {};
+    virtual void Initialize();
     virtual void Update(int delta_time) {};
     virtual void FillMFObjectPart(cs::MFObjectPart* part_data) {};
     virtual void FillMFObjectFull(cs::MFObjectFull* full_data) {};
diff --git a/server/gameserver/human.cc b/server/gameserver/human.cc
index 0e28a29..034d477 100644
--- a/server/gameserver/human.cc
+++ b/server/gameserver/human.cc
@@ -38,6 +38,7 @@ Human::~Human()
 
 void Human::Initialize()
 {
+    Entity::Initialize();
 }
 
 float Human::GetSpeed()
diff --git a/server/gameserver/loot.cc b/server/gameserver/loot.cc
index 7e946db..d441972 100644
--- a/server/gameserver/loot.cc
+++ b/server/gameserver/loot.cc
@@ -4,6 +4,7 @@
 #include "metamgr.h"
 #include "room.h"
 #include "collider.h"
+#include "entity.h"
 
 Loot::Loot():Entity()
 {
@@ -16,6 +17,7 @@ Loot::~Loot()
 
 void Loot::Initialize()
 {
+    Entity::Initialize();
     RecalcSelfCollider();
 }
 
diff --git a/server/gameserver/obstacle.cc b/server/gameserver/obstacle.cc
index c4fadf7..c9f6ebf 100644
--- a/server/gameserver/obstacle.cc
+++ b/server/gameserver/obstacle.cc
@@ -17,6 +17,7 @@ Obstacle::~Obstacle()
 
 void Obstacle::Initialize()
 {
+    Entity::Initialize();
     health = meta->i->hp();
     RecalcSelfCollider();
 }
diff --git a/server/gameserver/player.cc b/server/gameserver/player.cc
index e897df4..88b4c79 100644
--- a/server/gameserver/player.cc
+++ b/server/gameserver/player.cc
@@ -27,6 +27,7 @@ Player::~Player()
 
 void Player::Initialize()
 {
+    Human::Initialize();
     health = meta->i->health();
     RecalcSelfCollider();
 }
@@ -200,6 +201,22 @@ void Player::UpdateAction()
                         }
                     }
                     break;
+                case IS_PAIN_KILLER:
+                    {
+                        MetaData::Equip* item_meta = MetaMgr::Instance()->GetEquipBySlotId(action_item_id);
+                        if (item_meta){
+                            if (inventory[item_meta->i->_inventory_slot()] > 0) {
+                                float old_health = health;
+                                health += item_meta->i->heal();
+                                health = std::min(health, GetMaxHP());
+                                stats.heal_amount += health - old_health;
+                                --inventory[item_meta->i->_inventory_slot()];
+                                need_sync_active_player = true;
+                                SyncAroundPlayers();
+                            }
+                        }
+                    }
+                    break;
                 default:
                     {
                     }
@@ -241,6 +258,19 @@ void Player::UpdateUseItemIdx()
                 }
             }
             break;
+        case IS_PAIN_KILLER:
+            {
+                MetaData::Equip* item_meta = MetaMgr::Instance()->GetEquipBySlotId(use_item_idx);
+                if (item_meta) {
+                    StartAction(
+                                AT_UseItem,
+                                item_meta->i->use_time(),
+                                use_item_idx,
+                                0
+                                );
+                }
+            }
+            break;
         default:
             {
 
diff --git a/server/gameserver/room.cc b/server/gameserver/room.cc
index 3a60b70..f429f07 100644
--- a/server/gameserver/room.cc
+++ b/server/gameserver/room.cc
@@ -25,6 +25,12 @@ const int ANDROID_NUM = 0;
 const int ANDROID_NUM = 10;
 #endif
 
+static long long RoomXGetTickCount(void* context)
+{
+    Room* room = (Room*)context;
+    return room->frame_no;
+}
+
 Room::~Room()
 {
 
@@ -32,6 +38,8 @@ Room::~Room()
 
 void Room::Init()
 {
+    xtimer.Init(RoomXGetTickCount, this, 100, 100);
+
     ShuaAndroid();
     CreateThings();
     stats_timer_ = a8::Timer::Instance()->AddRepeatTimer(
@@ -61,6 +69,7 @@ void Room::Update(int delta_time)
     long long begin_tick = a8::XGetTickCount();
     elapsed_time_ += delta_time;
     while (elapsed_time_ >= 50) {
+        xtimer.Update();
         if (frame_no % 2 == 0) {
             ResetFrameData();
             UpdateGas();
diff --git a/server/gameserver/room.h b/server/gameserver/room.h
index 3d0431b..d365f3f 100644
--- a/server/gameserver/room.h
+++ b/server/gameserver/room.h
@@ -1,5 +1,8 @@
 #pragma once
 
+#include <a8/xtimer.h>
+#include <a8/timer_attacher.h>
+
 #include "framedata.h"
 
 namespace MetaData
@@ -31,6 +34,7 @@ public:
     bool game_over = false;
     long long game_over_frameno = 0;
     RoomProfile profile;
+    a8::XTimer xtimer;
 
     ~Room();
     void Init();
@@ -83,7 +87,6 @@ private:
     void OutputDebugLog();
 
 private:
-    a8::TimerAttacher timer_attacher_;
     timer_list* stats_timer_ = nullptr;
     int elapsed_time_ = 0;
     int alive_count_ = 0;
diff --git a/server/gameserver/smoke.cc b/server/gameserver/smoke.cc
index a4a3cd3..9c817a4 100644
--- a/server/gameserver/smoke.cc
+++ b/server/gameserver/smoke.cc
@@ -18,6 +18,7 @@ Smoke::~Smoke()
 
 void Smoke::Initialize()
 {
+    Entity::Initialize();
 }
 
 void Smoke::Update(int delta_time)