diff --git a/server/gameserver/building.cc b/server/gameserver/building.cc
index 751af79..7841e9d 100644
--- a/server/gameserver/building.cc
+++ b/server/gameserver/building.cc
@@ -34,6 +34,7 @@ void Building::RecalcSelfCollider()
         collider->_max = Vector2D(obj.x() + obj.width()/2.0 - meta->i->tilewidth()/2.0,
                                   obj.y() + obj.height()/2.0 - meta->i->tileheight()/2.0);
         AddCollider(collider);
+        room->map_service.AddCollider(collider);
     }
 }
 
diff --git a/server/gameserver/mapservice.cc b/server/gameserver/mapservice.cc
index fb41cfc..93e9613 100644
--- a/server/gameserver/mapservice.cc
+++ b/server/gameserver/mapservice.cc
@@ -42,9 +42,20 @@ void MapService::Init(int width, int height, int cell_width)
     cell_width_ = cell_width;
     max_grid_id_ = map_width_ * map_height_;
 
+    grid_offset_arr_[0] = - (map_width_ + 1);
+    grid_offset_arr_[1] = - (map_width_ + 0);
+    grid_offset_arr_[2] = - (map_width_ + -1);
+
+    grid_offset_arr_[3] = - 1;
+    grid_offset_arr_[4] = 0;
+    grid_offset_arr_[5] = 1;
+
+    grid_offset_arr_[6] = map_width_ - 1;
+    grid_offset_arr_[7] = map_width_;
+    grid_offset_arr_[8] = map_width_ + 1;
+
     map_cells_ = (list_head*)malloc(sizeof(list_head) * width * height);
     memset(map_cells_, sizeof(list_head) * width * height, 0);
-
 }
 
 void MapService::UnInit()
@@ -54,6 +65,9 @@ void MapService::UnInit()
 
 void MapService::AddCollider(ColliderComponent* collider)
 {
+#if MAP_SERVICE
+    return;
+#endif
     CellNode* top_node = nullptr;
     CellNode* bot_node = nullptr;
     switch (collider->type) {
@@ -146,17 +160,30 @@ bool MapService::Walkable(float world_x, float world_y)
         list_empty(&node);
 }
 
-void MapService::TouchAroundCell(float world_x, float world_y,
-                                 std::function<bool (ColliderComponent*)> callback)
+void MapService::GetColliders(float world_x, float world_y, std::set<ColliderComponent*>& colliders)
 {
-
+    int center_grid_id = GetGridId(world_x, world_y);
+    if (center_grid_id < 0 || center_grid_id >= max_grid_id_) {
+        return;
+    }
+    for (size_t i = 0; i < a8::ArraySize(grid_offset_arr_); ++i) {
+        int grid_id = center_grid_id + grid_offset_arr_[i];
+        if (grid_id >= 0 && grid_id < max_grid_id_) {
+            list_head* head = &map_cells_[grid_id];
+            if (head->next == nullptr && head->prev == nullptr) {
+                continue;
+            }
+            struct CellNode *node, *tmp;
+            struct list_head tv_list;
+            list_for_each_entry_safe(node, tmp, &tv_list, entry) {
+                colliders.insert(node->collider);
+            }
+        }
+    }
 }
 
 int MapService::GetGridId(float world_x, float world_y)
 {
-    int x = world_x + cell_width_;
-    int y = world_y + cell_width_;
-    assert(x >= 0 && y >= 0);
-    int grid_id = x/cell_width_ + (y/cell_width_) * map_width_;
+    int grid_id = world_x/cell_width_ + (world_y/cell_width_) * map_width_;
     return grid_id;
 }
diff --git a/server/gameserver/mapservice.h b/server/gameserver/mapservice.h
index 8cae1c8..dcf71f0 100644
--- a/server/gameserver/mapservice.h
+++ b/server/gameserver/mapservice.h
@@ -21,8 +21,7 @@ class MapService
     void AddCollider(ColliderComponent* collider);
     void RemoveCollider(ColliderComponent* collider);
     bool Walkable(float world_x, float world_y);
-    void TouchAroundCell(float world_x, float world_y,
-                         std::function<bool (ColliderComponent*)> callback);
+    void GetColliders(float world_x, float world_y, std::set<ColliderComponent*>& colliders);
 
  private:
     int GetGridId(float world_x, float world_y);
diff --git a/server/gameserver/obstacle.cc b/server/gameserver/obstacle.cc
index cb0e896..a4ecbc5 100644
--- a/server/gameserver/obstacle.cc
+++ b/server/gameserver/obstacle.cc
@@ -34,6 +34,24 @@ void Obstacle::RecalcSelfCollider()
             self_collider2_ = new AabbCollider();
             self_collider2_->owner = this;
             AddCollider(self_collider2_);
+            Vector2D old_pos = pos;
+            {
+                pos = Vector2D(building->pos.x + door_state1->x() - building->meta->i->tilewidth() / 2.0,
+                               building->pos.y + door_state1->y() - building->meta->i->tileheight() / 2.0);
+                self_collider2_->_min = Vector2D(0.0f - door_state0->width() / 2.0f,
+                                                 0.0f - door_state0->height() / 2.0f);
+                self_collider2_->_max = Vector2D(door_state0->width() / 2.0f, door_state0->height() / 2.0f);
+                room->map_service.AddCollider(self_collider2_);
+            }
+            {
+                pos = Vector2D(building->pos.x + door_state0->x() - building->meta->i->tilewidth() / 2.0,
+                               building->pos.y + door_state0->y() - building->meta->i->tileheight() / 2.0);
+                self_collider2_->_min = Vector2D(0.0f - door_state1->width() / 2.0f,
+                                                 0.0f - door_state1->height() / 2.0f);
+                self_collider2_->_max = Vector2D(door_state1->width() / 2.0f, door_state1->height() / 2.0f);
+                room->map_service.AddCollider(self_collider2_);
+            }
+            pos = old_pos;
         }
         if (door_state == DoorStateClose) {
             self_collider2_->_min = Vector2D(0.0f - door_state0->width() / 2.0f,
@@ -55,6 +73,7 @@ void Obstacle::RecalcSelfCollider()
                 }
                 self_collider_->pos = Vector2D();
                 self_collider_->rad = meta->i->height() / 2.0;
+                room->map_service.AddCollider(self_collider_);
             }
             break;
         case 2:
@@ -66,6 +85,7 @@ void Obstacle::RecalcSelfCollider()
                 }
                 self_collider2_->_min = Vector2D(meta->i->width() / -2.0f, meta->i->height() / -2.0f);
                 self_collider2_->_max = Vector2D(meta->i->width() / 2.0f, meta->i->height() / 2.0f);
+                room->map_service.AddCollider(self_collider2_);
             }
             break;
         }