针对数据通讯传输中的安全及加密问题 ,分析了 IP协议的安全体系结构和虚拟专用网的原理 ,论述了基于 IPsec的虚拟专用网实现原理及相关技术 .认为 IPsec是目前唯一一种能为任何形式的 Internet通信提供安全保护的协议 ,具有良好的发展前景 . In view of the security and encryption in data communication transmission, the security architecture of IP protocol and the principle of virtual private network are analyzed, and the realization principle and related technologies of virtual private network based on IPsec are discussed. IPsec is the only one that can Any form of Internet communications to provide security protocols, has good prospects for development.