diff --git a/server/gameserver/mapinstance.cc b/server/gameserver/mapinstance.cc
index 1b21375..929227c 100644
--- a/server/gameserver/mapinstance.cc
+++ b/server/gameserver/mapinstance.cc
@@ -70,6 +70,7 @@ void MapInstance::AttachRoom(Room* room, RoomInitInfo& init_info)
     init_info.map_meta = map_meta_;
     init_info.grid_service = grid_service_;
     init_info.map_service = map_service_;
+    init_info.map_instance = this;
     init_info.mini_room_spawn_points = &mini_room_spawn_points_;
     init_info.normal_room_spawn_points = &normal_room_spawn_points_;
     init_info.room_monster_spawn_points = &room_monster_spawn_points_;
diff --git a/server/gameserver/mapinstance.h b/server/gameserver/mapinstance.h
index 2891ff3..2225e9d 100644
--- a/server/gameserver/mapinstance.h
+++ b/server/gameserver/mapinstance.h
@@ -23,7 +23,7 @@ class MapInstance
 
     void AttachRoom(Room* room, RoomInitInfo& init_info);
     MetaData::Map* GetMapMeta() { return map_meta_; }
-
+    Entity* GetEntityByUniId(int uniid);
  private:
     void CreateThings();
     void CreateTerrain();
@@ -34,7 +34,6 @@ class MapInstance
                                      bool no_grid_service = false,
                                      int collider_param1 = 0,
                                      int collider_param2 = 0);
-    Entity* GetEntityByUniId(int uniid);
     int AllocUniid();
 
  private:
diff --git a/server/gameserver/obstacle.cc b/server/gameserver/obstacle.cc
index 0a1511c..bb9cbb5 100644
--- a/server/gameserver/obstacle.cc
+++ b/server/gameserver/obstacle.cc
@@ -615,6 +615,17 @@ bool Obstacle::DoInteraction(Human* sender)
              });
         return true;
     }
+    switch (meta->i->thing_type()) {
+    case kObstacleHideHouse:
+        {
+            DoHideHouseInteraction(sender);
+        }
+        break;
+    default:
+        {
+        }
+        break;
+    }
     return false;
 }
 
@@ -622,3 +633,57 @@ void Obstacle::OnCollisionTrigger(Creature* c)
 {
 
 }
+
+void Obstacle::DoHideHouseInteraction(Human* sender)
+{
+    auto p = GetInteractionData(sender);
+    if (p) {
+        sender->SetPos(std::get<1>(*p));
+        ClearObstacleBuff(sender);
+    } else {
+        sender->SetPos(GetPos());
+        AddObstacleBuff(sender);
+        ObstacleData* p = sender->room->GetPermanentObstacleData(GetUniId());
+        if (!a8::HasBitFlag(p->flags, kHealth)) {
+            p->health = health_;
+            a8::SetBitFlag(p->flags, kHealth);
+        }
+        if (!p->interaction_humans) {
+            p->interaction_humans = new std::map<int, std::tuple<long long, a8::Vec2>>();
+        }
+        (*p->interaction_humans)[sender->GetUniId()] = std::make_tuple
+            (sender->room->GetFrameNo(), sender->GetPos());
+    }
+}
+
+std::tuple<long long, a8::Vec2>* Obstacle::GetInteractionData(Human* sender)
+{
+    if (IsPermanent()) {
+        ObstacleData* p = sender->room->GetPermanentObstacleData(GetUniId());
+        if (!a8::HasBitFlag(p->flags, kHealth)) {
+            p->health = health_;
+            a8::SetBitFlag(p->flags, kHealth);
+        }
+        if (!p->interaction_humans) {
+            return nullptr;
+        }
+        auto itr = p->interaction_humans->find(sender->GetUniId());
+        return itr != p->interaction_humans->end() ? &itr->second : nullptr;
+    } else {
+        return nullptr;
+    }
+}
+
+void Obstacle::AddObstacleBuff(Creature* c)
+{
+    for (int buff_id : meta->buff_list) {
+        c->TryAddBuff(c, buff_id);
+    }
+}
+
+void Obstacle::ClearObstacleBuff(Creature* c)
+{
+    for (int buff_id : meta->buff_list) {
+        c->RemoveBuffById(buff_id);
+    }
+}
diff --git a/server/gameserver/obstacle.h b/server/gameserver/obstacle.h
index 493fa87..0baf34b 100644
--- a/server/gameserver/obstacle.h
+++ b/server/gameserver/obstacle.h
@@ -69,6 +69,10 @@ class Obstacle : public Entity
 
 protected:
     Obstacle();
+    void DoHideHouseInteraction(Human* sender);
+    std::tuple<long long, a8::Vec2>* GetInteractionData(Human* sender);
+    void AddObstacleBuff(Creature* c);
+    void ClearObstacleBuff(Creature* c);
 
 protected:
     CircleCollider* self_collider_ = nullptr;
diff --git a/server/gameserver/room.cc b/server/gameserver/room.cc
index 4f1d481..385b779 100644
--- a/server/gameserver/room.cc
+++ b/server/gameserver/room.cc
@@ -62,6 +62,7 @@ void Room::InitData(RoomInitInfo& init_info)
     map_tpl_name_ = init_info.map_tpl_name;
     grid_service = init_info.grid_service;
     map_service = init_info.map_service;
+    map_instance = init_info.map_instance;
     map_meta_ = init_info.map_meta;
     mini_room_spawn_points_ = init_info.mini_room_spawn_points;
     normal_room_spawn_points_ = init_info.normal_room_spawn_points;
@@ -203,6 +204,9 @@ Player* Room::GetPlayerByUniId(int uniid)
 
 Entity* Room::GetEntityByUniId(int uniid)
 {
+    if (uniid < FIXED_OBJECT_MAXID) {
+        return map_instance->GetEntityByUniId(uniid);
+    }
     auto itr = uniid_hash_.find(uniid);
     return itr != uniid_hash_.end() ? itr->second : nullptr;
 }
diff --git a/server/gameserver/room.h b/server/gameserver/room.h
index 37106e5..071ba0f 100644
--- a/server/gameserver/room.h
+++ b/server/gameserver/room.h
@@ -48,6 +48,7 @@ public:
     a8::TimerAttacher timer_attacher;
     GridService* grid_service = nullptr;
     MapService* map_service = nullptr;
+    MapInstance* map_instance = nullptr;
     bool debug_trace = false;
     bool added_to_over_room = false;
     a8::Vec2 last_player_jump_pos;
diff --git a/server/gameserver/roomobstacle.cc b/server/gameserver/roomobstacle.cc
index bac37d6..c95a01e 100644
--- a/server/gameserver/roomobstacle.cc
+++ b/server/gameserver/roomobstacle.cc
@@ -511,50 +511,6 @@ bool RoomObstacle::DoInteraction(Human* sender)
     if (Obstacle::DoInteraction(sender)) {
         return true;
     }
-    switch (meta->i->thing_type()) {
-    case kObstacleHideHouse:
-        {
-            DoHideHouseInteraction(sender);
-        }
-        break;
-    default:
-        {
-        }
-        break;
-    }
     return true;
 }
 
-void RoomObstacle::DoHideHouseInteraction(Human* sender)
-{
-    auto p = GetInteractionData(sender);
-    if (p) {
-        sender->SetPos(std::get<1>(*p));
-        ClearObstacleBuff(sender);
-    } else {
-        sender->SetPos(GetPos());
-        AddObstacleBuff(sender);
-        interaction_humans_[sender->GetUniId()] = std::make_tuple
-            (room->GetFrameNo(), sender->GetPos());
-    }
-}
-
-std::tuple<long long, a8::Vec2>* RoomObstacle::GetInteractionData(Human* sender)
-{
-    auto itr = interaction_humans_.find(sender->GetUniId());
-    return itr != interaction_humans_.end() ? &itr->second : nullptr;
-}
-
-void RoomObstacle::AddObstacleBuff(Creature* c)
-{
-    for (int buff_id : meta->buff_list) {
-        c->TryAddBuff(c, buff_id);
-    }
-}
-
-void RoomObstacle::ClearObstacleBuff(Creature* c)
-{
-    for (int buff_id : meta->buff_list) {
-        c->RemoveBuffById(buff_id);
-    }
-}
diff --git a/server/gameserver/roomobstacle.h b/server/gameserver/roomobstacle.h
index f51f213..e4ca658 100644
--- a/server/gameserver/roomobstacle.h
+++ b/server/gameserver/roomobstacle.h
@@ -36,18 +36,11 @@ private:
     void ActiveHideHouse();
     void ActiveGully();
 
-    void DoHideHouseInteraction(Human* sender);
-
-    std::tuple<long long, a8::Vec2>* GetInteractionData(Human* sender);
-    void AddObstacleBuff(Creature* c);
-    void ClearObstacleBuff(Creature* c);
-
 protected:
     bool temp_through_ = false;
     std::set<GridCell*>* grid_list_ = nullptr;
     int explosion_times_ = 0;
     bool detached_ = false;
-    std::map<int, std::tuple<long long, a8::Vec2>> interaction_humans_;
 
     RoomObstacle();
 
diff --git a/server/gameserver/types.h b/server/gameserver/types.h
index 0afb07f..8f5f7b8 100755
--- a/server/gameserver/types.h
+++ b/server/gameserver/types.h
@@ -151,6 +151,7 @@ struct ObstacleData
 
     int door_open_times = 0;
     DoorState_e door_state = DoorStateClose;
+    std::map<int, std::tuple<long long, a8::Vec2>>* interaction_humans = nullptr;
 };
 
 struct KillInfo
@@ -178,6 +179,7 @@ struct ObjectSyncFlags
 
 class GridService;
 class MapService;
+class MapInstance;
 class Building;
 struct RoomInitInfo
 {
@@ -196,6 +198,7 @@ struct RoomInitInfo
     std::string map_tpl_name;
     GridService* grid_service = nullptr;
     MapService* map_service = nullptr;
+    MapInstance* map_instance = nullptr;
     const std::vector<MetaData::MapTplThing*>* mini_room_spawn_points = nullptr;
     const std::vector<MetaData::MapTplThing*>* normal_room_spawn_points = nullptr;
     const std::vector<MetaData::MapTplThing*>* room_monster_spawn_points = nullptr;