diff --git a/component/navigation.go b/component/navigation.go
new file mode 100644
index 0000000..bda698b
--- /dev/null
+++ b/component/navigation.go
@@ -0,0 +1,3 @@
+package component
+
+// TODO
diff --git a/game/terrain_2d.go b/game/terrain_2d.go
new file mode 100644
index 0000000..38c8010
--- /dev/null
+++ b/game/terrain_2d.go
@@ -0,0 +1,9 @@
+package game
+
+// Terrain2D 地形
+type Terrain2D interface {
+	GetBlock(x, y int) Terrain2DBlock
+	GetBlocks() [][]Terrain2DBlock
+	GetWidth() int
+	GetHeight() int
+}
diff --git a/game/terrain_2d_block.go b/game/terrain_2d_block.go
new file mode 100644
index 0000000..fb03be9
--- /dev/null
+++ b/game/terrain_2d_block.go
@@ -0,0 +1,9 @@
+package game
+
+// Terrain2DBlock 地形块
+type Terrain2DBlock interface {
+	// GetTerrain 获取归属的地形
+	GetTerrain() Terrain2D
+	// GetCost 获取移动消耗
+	GetCost() float64
+}