虚拟专用网简称虚拟网 ,是智能网提供的一种业务 ,它可按用户需求灵活组建非永久性专用网。文章就虚拟网的概念、特点、产品、结构、业务种类和传统专网的区别以及实现方法作了介绍 ,并预测了它的发展前景。 Virtual Private Network Referred to as a virtual network, is a kind of business that the intelligent network offers, it can be flexibly set up the non-permanent private network according to the user’s demand. This paper introduces the concept, characteristics, products, structure, types of services and differences between traditional private networks and their implementation methods, and forecasts their development prospects.