虚拟网络作为新型企业网互连方案，越来越为人们所重视。它可以减少网络管理开销，有灵活的组网方式和逻辑拓扑结构，并且可以有效地避免广播风暴，节省带宽。本文介绍了虚拟网络的基本概念、实现途径和发展前景。 Virtual network as a new enterprise network interconnection program, more and more people attach importance. It can reduce network management overhead, flexible networking and logical topology, and can effectively avoid broadcast storms and save bandwidth. This article describes the basic concepts of virtual networks, ways to achieve and development prospects.