diff --git a/main.py b/main.py
index 9f4413c..11a7b3e 100644
--- a/main.py
+++ b/main.py
@@ -29,7 +29,7 @@ while running:
             if event.button == 1:  # 左键放置方块
                 if block.id == "air":
                     player.put_block(bx, by)
-            elif event.button == 3:  # 右键拆除方块
+            elif event.button == 3 and block.destroyable:  # 右键拆除方块
                 player.put_block(bx, by, 'delete')
         elif event.type == pygame.KEYDOWN:
             if event.key == pygame.K_1:
diff --git a/module/__init__.py b/module/__init__.py
index 6d0d58a..f43d5d1 100644
--- a/module/__init__.py
+++ b/module/__init__.py
@@ -8,6 +8,7 @@ COLORS = {
     "stone": (128, 128, 128),
     "sand": (238, 232, 170),
     "water": (0, 0, 255),
+    "bedrock": (0, 0, 0),
     "player": (255, 0, 0)
 }
 
diff --git a/module/block.py b/module/block.py
index 97db6c6..5455ccd 100644
--- a/module/block.py
+++ b/module/block.py
@@ -12,6 +12,7 @@ class Block:
     flowable = False # 可流动
     fallible = False # 可下坠
     collision = True # 可以碰撞
+    destroyable = True # 可被破坏
 
     def __init__(self, x: int, y: int):
         self.x = x
@@ -42,7 +43,7 @@ class Block:
         # 判碰撞：
         return left < player.x < right and top < player.y < bottom
 
-    def get_collision_surface(self) -> tuple[int]:
+    def get_collision_surface(self) -> tuple[int, int, int, int]:
         # 获得方块表面界限（碰撞面）
         # 上、右、下、左
         real_x = self.x * BLOCK_SIZE + BLOCK_SIZE / 2
@@ -107,4 +108,9 @@ class WaterBlock(Block):
     collision = False
 
     def __init__(self, x: int, y: int):
-        super().__init__(x, y)
\ No newline at end of file
+        super().__init__(x, y)
+
+class BedrockBlock(Block):
+    id = 'bedrock'
+    color = COLORS.get(id)
+    destroyable = False
\ No newline at end of file
diff --git a/module/utils.py b/module/utils.py
index 3c2da17..61a4b17 100644
--- a/module/utils.py
+++ b/module/utils.py
@@ -1,6 +1,6 @@
 import random
 from module import WIDTH, BLOCK_SIZE, HEIGHT
-from module.block import StoneBlock, GrassBlock, DirtBlock, AirBlock, Block
+from module.block import StoneBlock, GrassBlock, DirtBlock, AirBlock, Block, BedrockBlock
 
 
 # 生成地形
@@ -9,17 +9,29 @@ def generate_terrain() -> list[list[Block]]:
     ground_level = HEIGHT // BLOCK_SIZE // 2
 
     for x in range(WIDTH // BLOCK_SIZE):
+        #
+        #             AIR BLOCK
+        # height ============================= GRASS BLOCK
+        #  4          DIRT BLOCK
+        # +5     =============================
+        #             STONE BLOCK
+        # max    ============================= BEDROCK BLOCK
+        #
         column = []
         height = ground_level + random.randint(-3, 3)
         for y in range(HEIGHT // BLOCK_SIZE):
-            if y > height + 2:
-                column.append(StoneBlock(x, y))
+            if y < height:
+                block = AirBlock(x, y)
             elif y == height:
-                column.append(GrassBlock(x, y))
-            elif y > height - 3:
-                column.append(DirtBlock(x, y))
+                block = GrassBlock(x, y)
+            elif height < y < height + 5:
+                block = DirtBlock(x, y)
+            elif y == HEIGHT // BLOCK_SIZE - 1:
+                block = BedrockBlock(x, y)
             else:
-                column.append(AirBlock(x, y))
+                block = StoneBlock(x, y)
+            column.append(block)
+
         world.append(column)
 
     return world
\ No newline at end of file