中文摘要：

随着Internet与移动通信的飞速发展及相互融合，通过无线网络高速接入到Internet成为现实，即时通信软件作为一种便捷的网络通信工具，其应用范围从单纯的网络聊天工具逐渐变成工作生活所不可缺的信息交流平台。采用Socket网络编程设计，在Android平台下实现了基于TCP/IP协议的网络通信系统。实验测试证明，系统运行正常，可以实现在Android平台上的即时通信功能。

英文摘要：

With the rapid development and mutual fusion of Internet and mobile communication,it comes true for the network communication system to access the Internet through highspeed wireless network. As a kind of convenient network communication tool,the instant messaging software has gradually turned into indispensable platform for the exchange of information in work and life from the simple network chat tool. The network communication system based on TCP/IP protocol was realized on the platform of Android,which uses the Socket network programming. The experiment and testing show that the system runs well,and can achieve realtime communication function on Android platform.