diff --git a/history/001_first_version/src/main/java/com/github/drinkjava2/frog/egg/Zone.java b/history/001_first_version/src/main/java/com/github/drinkjava2/frog/egg/Zone.java
new file mode 100644
index 0000000..848059a
--- /dev/null
+++ b/history/001_first_version/src/main/java/com/github/drinkjava2/frog/egg/Zone.java
@@ -0,0 +1,56 @@
+/*
+ * 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.github.drinkjava2.frog.egg;
+
+import java.io.Serializable;
+
+/**
+ * Zone represents a position in brain
+ * 
+ * @author Yong Zhu
+ * @since 1.0.0
+ */
+public class Zone implements Serializable {
+	private static final long serialVersionUID = 3L;
+	public float x;
+	public float y;
+	public float radius;
+
+	public Zone() {
+		// 空构造器不能省，FastJSON实例化时要用到
+	}
+
+	public Zone(float x, float y, float radius) {
+		this.x = x;
+		this.y = y;
+		this.radius = radius;
+	}
+
+	public boolean nearby(Zone z) {
+		float dist = radius + z.radius;
+		if (Math.abs(x - z.x) < dist && Math.abs(y - z.y) < dist)
+			return true;
+		return false;
+	}
+
+	public int roundX() {
+		return Math.round(x);
+	}
+
+	public int roundY() {
+		return Math.round(y);
+	}
+
+	public static void copyXY(Zone from, Zone to) {
+		to.x = from.x;
+		to.y = from.y;
+	}
+}