diff --git a/core/src/main/java/com/gitee/drinkjava2/frog/egg/FrogEggTool.java b/core/src/main/java/com/gitee/drinkjava2/frog/egg/FrogEggTool.java
new file mode 100644
index 0000000..57d8d78
--- /dev/null
+++ b/core/src/main/java/com/gitee/drinkjava2/frog/egg/FrogEggTool.java
@@ -0,0 +1,127 @@
+/*
+ * 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.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.Comparator;
+
+import com.gitee.drinkjava2.frog.Animal;
+import com.gitee.drinkjava2.frog.Application;
+import com.gitee.drinkjava2.frog.Env;
+import com.gitee.drinkjava2.frog.Frog;
+import com.gitee.drinkjava2.frog.util.LocalFileUtils;
+import com.gitee.drinkjava2.frog.util.Logger;
+
+/**
+ * FrogEggTool save/load frog eggs to file
+ * 
+ * @author Yong Zhu
+ * @since 1.0
+ */
+@SuppressWarnings("all")
+public class FrogEggTool {
+
+    /**
+     * Frogs which have higher fat value lay eggs
+     * 
+     * 利用Java串行机制存盘。 更肥的(也就是吃的更多)的Frog下蛋并存盘, 以进行下一轮测试，瘦的Frog被淘汰，没有下蛋的资格。
+     * 用fat值来作为唯一的生存竟争标准
+     */
+    public static void layEggs() {
+        for (Frog f : Env.frogs) { 
+            if (f.fat == 1000000000) //躺平的扣最多分，不允许躺平
+                f.kill();
+        }
+        sortFrogsOrderByFat();
+        Frog first = Env.frogs.get(0);
+        Frog last = Env.frogs.get(Env.frogs.size() - 1);
+        try {
+            Env.frog_eggs.clear();
+            for (int i = 0; i < Env.FROG_EGG_QTY; i++) //每次下蛋数量固定为EGG_QTY个
+                Env.frog_eggs.add(new Egg(Env.frogs.get(i)));
+            Logger.info(Env.round+" Frist frog fat={}, gene size={}, Last frog fat={}", first.fat, getGeneSize(first), last.fat);
+            //Logger.info("Frist frog consts="+Arrays.toString(first.consts)); //debug
+
+            if (Env.SAVE_EGGS_FILE) {
+                FileOutputStream fo = new FileOutputStream(Application.CLASSPATH + "frog_eggs.ser");
+                ObjectOutputStream so = new ObjectOutputStream(fo);
+                so.writeObject(Env.frog_eggs);
+                so.close();
+                Logger.info(". Saved {} eggs to file '{}frog_eggs.ser'", Env.frog_eggs.size(), Application.CLASSPATH);
+            }
+        } catch (IOException e) {
+            Logger.error(e);
+        }
+    }
+
+    private static String getGeneSize(Frog f) {//按genes类型汇总每种基因的个数
+        StringBuilder sb = new StringBuilder("[");
+        for (int i = 0; i < f.genes.size(); i++)
+            sb.append(f.genes.get(i).size()).append(",");
+        if (sb.length() > 1)
+            sb.setLength(sb.length() - 1);
+        sb.append("]");
+        return sb.toString();
+    }
+
+    private static void sortFrogsOrderByFat() {// 给青蛙从肥到瘦排个序
+        Collections.sort(Env.frogs, new Comparator<Animal>() {
+            public int compare(Animal a, Animal b) {
+                if (a.fat > b.fat)
+                    return -1;
+                else if (a.fat == b.fat)
+                    return 0;
+                else
+                    return 1;
+            }
+        });
+    }
+
+    public static void deleteEggs() {
+        boolean success = LocalFileUtils.deleteFile(Application.CLASSPATH + "frog_eggs.ser");
+        Logger.info("Deleting egg file '{}frog_eggs.ser': {}", Application.CLASSPATH, success ? "Deleted" : "Not found");
+    }
+
+    /**
+     * 从磁盘读入一批frog Egg
+     */
+    @SuppressWarnings("unchecked")
+    public static void loadFrogEggs() {
+        boolean errorfound = false;
+        try {
+            FileInputStream eggsFile = new FileInputStream(Application.CLASSPATH + "frog_eggs.ser");
+            ObjectInputStream eggsInputStream = new ObjectInputStream(eggsFile);
+            Env.frog_eggs = (ArrayList<Egg>) eggsInputStream.readObject();
+            Logger.info("Loaded " + Env.frog_eggs.size() + " eggs from file '" + Application.CLASSPATH + "frog_eggs.ser" + "'.\n");
+            //System.out.println(Env.frog_eggs.get(0).lines.size());  //debug
+            eggsInputStream.close();
+        } catch (Exception e) {
+            errorfound = true;
+        }
+        if (errorfound) {
+            Env.frog_eggs.clear();
+            for (int j = 0; j < Env.FROG_EGG_QTY; j++) {
+                Egg egg = new Egg();
+                Env.frog_eggs.add(egg);
+            }
+            Logger.info("Fail to load frog egg file '" + Application.CLASSPATH + "frog_eggs.ser" + "', created " + Env.frog_eggs.size() + " eggs to do test.");
+        }
+
+    }
+
+}