diff --git a/Column.java b/Column.java
new file mode 100644
index 0000000..e96c6dc
--- /dev/null
+++ b/Column.java
@@ -0,0 +1,35 @@
+package com;
+
+import java.awt.image.BufferedImage;
+
+public class Column {
+	int x, y;
+	int width, height;
+	BufferedImage co_image;
+
+	int gap; // 上下间隙
+	int distance; // 水平间隙
+
+	int min = -(1200 / 2 - 144 / 2);
+	int max = 644 - 146 - 144 / 2 - 1200 / 2;
+
+	public Column() {
+		co_image = BirdGame.col_img;
+		width = co_image.getWidth();
+		// width = (int) (Math.random() * 20 + 150);
+		height = co_image.getHeight();
+		x = 432;
+		y = (int) (Math.random() * (max - min) + min);
+		gap = 144; // 144
+		distance = 244;
+	}
+
+	public void star() {
+		x = x - 1;
+		if (x <= -width) { // 柱子越界
+			x = 432;
+			// 重新随机
+			y = (int) (Math.random() * (max - min) + min);
+		}
+	}
+}