diff --git a/server/gameserver/mapservice.cc b/server/gameserver/mapservice.cc
new file mode 100644
index 0000000..a039818
--- /dev/null
+++ b/server/gameserver/mapservice.cc
@@ -0,0 +1,63 @@
+#include "precompile.h"
+
+#include <memory.h>
+
+#include "mapservice.h"
+
+MapService::MapService()
+{
+
+}
+
+MapService::~MapService()
+{
+    if (map_cells_) {
+        free(map_cells_);
+        map_cells_ = nullptr;
+    }
+}
+
+void MapService::Init(int width, int height, int cell_width)
+{
+    if (width < 1 || height < 1 || cell_width < 1) {
+        abort();
+    }
+    map_width_ = width;
+    map_height_ = height;
+    cell_width_ = cell_width;
+    max_grid_id_ = map_width_ * map_height_;
+
+    map_cells_ = (list_head*)malloc(sizeof(list_head) * width * height);
+    memset(map_cells_, sizeof(list_head) * width * height, 0);
+
+}
+
+void MapService::UnInit()
+{
+
+}
+
+bool MapService::Walkable(float world_x, float world_y)
+{
+    int grid_id = GetGridId(world_x, world_y);
+    if (grid_id < 0 || grid_id >= max_grid_id_) {
+        return false;
+    }
+    list_head& node = map_cells_[grid_id];
+    return node.next == nullptr && node.prev == nullptr;
+}
+
+void MapService::TouhcAroundCell(float world_x, float world_y,
+                                 std::function<bool (ColliderComponent*)> callback)
+{
+
+}
+
+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_;
+    return grid_id;
+}
diff --git a/server/gameserver/mapservice.h b/server/gameserver/mapservice.h
new file mode 100644
index 0000000..0a24c12
--- /dev/null
+++ b/server/gameserver/mapservice.h
@@ -0,0 +1,35 @@
+#pragma once
+
+class Entity;
+class Human;
+class Bullet;
+
+class Human;
+class Entity;
+class Room;
+class ColliderComponent;
+class MapService
+{
+ public:
+    MapService();
+    ~MapService();
+
+    void Init(int width, int height, int cell_width);
+    void UnInit();
+
+    bool Walkable(float world_x, float world_y);
+    void TouhcAroundCell(float world_x, float world_y,
+                         std::function<bool (ColliderComponent*)> callback);
+
+ private:
+    int GetGridId(float world_x, float world_y);
+
+ private:
+    list_head* map_cells_ = nullptr;
+    int map_width_ = 0;
+    int map_height_ = 0;
+    int cell_width_ = 0;
+    int max_grid_id_ = 0;
+    int grid_offset_arr_[9] = {0};
+
+};
diff --git a/server/gameserver/room.cc b/server/gameserver/room.cc
index 6ee4e32..1293042 100644
--- a/server/gameserver/room.cc
+++ b/server/gameserver/room.cc
@@ -1301,3 +1301,4 @@ void Room::NotifyWxVoip()
                                      },
                                      &xtimer_attacher.timer_list_);
 }
+