diff --git a/Ground.java b/Ground.java
new file mode 100644
index 0000000..7bb223f
--- /dev/null
+++ b/Ground.java
@@ -0,0 +1,25 @@
+package com;
+
+import java.awt.image.BufferedImage;
+
+public class Ground {
+	int x, y;
+	int width, height;
+	BufferedImage img_ground; // 地面图片
+
+	public Ground() {
+		img_ground = BirdGame.ground;
+		x = 0;
+		y = BirdGame.bg.getHeight() - img_ground.getHeight();
+		width = img_ground.getWidth();
+		height = img_ground.getHeight();
+	}
+
+	// 地面移动
+	public void step() {
+		x = x - 1;
+		if (x <= 432 - width) {
+			x = 0;
+		}
+	}
+}