本文通过理论联系实际，利用vc++工具，利用mfc封装的API类设计一个能实现最基本的多用户的双机通信程序，既聊天室，旨在阐述网络程序设计的基本过程，tcp/ip协议的应用开发，多线程的应用特点。-In this paper, theory with practice, the use of vc++ Tool mfc package API category to achieve the most basic design of a multi-user dual-machine communication procedures, both the chat rooms to network programming on the basic processes, tcp/ip protocol applications development, multi-threaded application characteristics.