diff --git a/history/006_snake/src/main/java/com/gitee/drinkjava2/frog/egg/SnakeEggTool.java b/history/006_snake/src/main/java/com/gitee/drinkjava2/frog/egg/SnakeEggTool.java
new file mode 100644
index 0000000..4e53154
--- /dev/null
+++ b/history/006_snake/src/main/java/com/gitee/drinkjava2/frog/egg/SnakeEggTool.java
@@ -0,0 +1,130 @@
+/*
+ * Copyright 2018 the original author or authors. 
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by
+ * applicable law or agreed to in writing, software distributed under the
+ * License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS
+ * OF ANY KIND, either express or implied. See the License for the specific
+ * language governing permissions and limitations under the License.
+ */
+package com.gitee.drinkjava2.frog.egg;
+
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.List;
+
+import com.gitee.drinkjava2.frog.Application;
+import com.gitee.drinkjava2.frog.Env;
+import com.gitee.drinkjava2.frog.Snake;
+import com.gitee.drinkjava2.frog.organ.Active;
+import com.gitee.drinkjava2.frog.organ.snake.SnakeBigEye;
+import com.gitee.drinkjava2.frog.organ.snake.SnakeEyes;
+import com.gitee.drinkjava2.frog.organ.snake.SnakeMouth;
+import com.gitee.drinkjava2.frog.organ.snake.SnakeMoves;
+import com.gitee.drinkjava2.frog.util.LocalFileUtils;
+
+/**
+ * SnakeEggTool save/load snake eggs to file
+ * 
+ * @author Yong Zhu
+ * @since 1.0
+ */
+@SuppressWarnings("all")
+public class SnakeEggTool {
+
+	/**
+	 * Snakes which have higher energy lay eggs
+	 * 
+	 * 利用Java串行机制存盘。 能量多(也就是吃的更多)的Snake下蛋并存盘, 以进行下一轮测试，能量少的Snake被淘汰，没有下蛋的资格。
+	 * 用能量的多少来简化生存竟争模拟，每次下蛋数量固定为EGG_QTY个
+	 */
+	public static void layEggs() {
+		if (!Env.SNAKE_MODE)
+			return;
+		sortSnakesOrderByEnergyDesc();
+		Snake first = Env.snakes.get(0);
+		Snake last = Env.snakes.get(Env.snakes.size() - 1);
+		try {
+			Env.snake_eggs.clear();
+			for (int i = 0; i < Env.SNAKE_EGG_QTY; i++)
+				Env.snake_eggs.add(new Egg(Env.snakes.get(i)));
+			FileOutputStream fo = new FileOutputStream(Application.CLASSPATH + "snake_eggs.ser");
+			ObjectOutputStream so = new ObjectOutputStream(fo);
+			so.writeObject(Env.snake_eggs);
+			so.close();
+			System.out.print("Fist snake has " + first.organs.size() + " organs,  energy=" + first.energy);
+			System.out.println(", Last snake has " + last.organs.size() + " organs,  energy=" + last.energy);
+			System.out.println(
+					"Saved " + Env.snake_eggs.size() + " eggs to file '" + Application.CLASSPATH + "snake_eggs.ser'");
+		} catch (IOException e) {
+			System.out.println(e);
+		}
+	}
+
+	private static void sortSnakesOrderByEnergyDesc() {// 按能量多少给青蛙排序
+		Collections.sort(Env.snakes, new Comparator<Snake>() {
+			public int compare(Snake a, Snake b) {
+				if (a.energy > b.energy)
+					return -1;
+				else if (a.energy == b.energy)
+					return 0;
+				else
+					return 1;
+			}
+		});
+	}
+
+	public static void deleteEggs() {
+		System.out.println("Delete exist egg file: '" + Application.CLASSPATH + "snake_eggs.ser'");
+		LocalFileUtils.deleteFile(Application.CLASSPATH + "snake_eggs.ser");
+	}
+
+	/**
+	 * 从磁盘读入一批snake Egg
+	 */
+	@SuppressWarnings("unchecked")
+	public static void loadSnakeEggs() {
+		boolean errorfound = false;
+		try {
+			FileInputStream eggsFile = new FileInputStream(Application.CLASSPATH + "snake_eggs.ser");
+			ObjectInputStream eggsInputStream = new ObjectInputStream(eggsFile);
+			Env.snake_eggs = (List<Egg>) eggsInputStream.readObject();
+			System.out.println("Loaded " + Env.snake_eggs.size() + " eggs from file '" + Application.CLASSPATH
+					+ "snake_eggs.ser" + "'.\n");
+			eggsInputStream.close();
+		} catch (Exception e) {
+			errorfound = true;
+		}
+		if (errorfound) {
+			Env.snake_eggs.clear();
+			for (int j = 0; j < Env.SNAKE_EGG_QTY; j++) {
+				Egg egg = new Egg();
+				float r = 30;
+				float h = 3;
+				egg.organs.add(new SnakeMouth().setXYZRHN(0, 0, 0, 0, h, "Eat")); // SnakeMouth不是感觉或输出器官，没有位置和大小
+				egg.organs.add(new SnakeBigEye().setXYZRHN(190, 90, 500, r * 2, h, "SnakeBigEye"));// 大眼睛，永远加在第1位
+				egg.organs.add(new Active().setXYZRHN(500, 600, 500, r, h, "Active")); // 永远激活
+				egg.organs.add(new SnakeMoves.MoveUp().setXYZRHN(800, 300, 500, r, h, "Up"));
+				egg.organs.add(new SnakeMoves.MoveDown().setXYZRHN(800, 600, 500, r, h, "Down"));
+				egg.organs.add(new SnakeMoves.MoveLeft().setXYZRHN(700, 450, 500, r, h, "Left"));
+				egg.organs.add(new SnakeMoves.MoveRight().setXYZRHN(900, 450, 500, r, h, "Right"));
+				egg.organs.add(new SnakeEyes.SeeUp().setXYZRHN(200, 500 + 90, 500, r, h, "SeeUp"));
+				egg.organs.add(new SnakeEyes.SeeDown().setXYZRHN(200, 500 - 90, 500, r, h, "SeeDown"));
+				egg.organs.add(new SnakeEyes.SeeLeft().setXYZRHN(200 - 90, 500, 500, r, h, "SeeLeft"));
+				egg.organs.add(new SnakeEyes.SeeRight().setXYZRHN(200 + 90, 500, 500, r, h, "SeeRight"));
+
+				Env.snake_eggs.add(egg);
+			}
+			System.out.println("Fail to load snake egg file '" + Application.CLASSPATH + "snake_eggs.ser"
+					+ "', created " + Env.snake_eggs.size() + " eggs to do test.");
+		}
+
+	}
+
+}