构架在传统的电信网上的因特网 ,业务爆炸性增长给传统电信网造成了严重的拥塞。解决因特网服务质量问题的核心在于建立一个宽带的骨干网。宽带IP网具有支持多种业务、廉价、通用性强和较好的扩展性等优势。随着MPLS协议和各种IPQoS建议的标准化 ,宽带IP将有效支持具有服务质量要求的IP业务。为了提高IP网的整体性能 ,各种新的QoS服务结构层出不穷。本文通过介绍IP网中几种QoS服务模型 ,强调MPLS是在大型IP网络中作为提供QoS保证的最具发展前景的技术 The Internet, which is framed on the traditional telecommunications network, has caused serious congestion in the traditional telecommunications network due to the explosive growth of business. The core of solving the problem of Internet service quality lies in establishing a broadband backbone network. Broadband IP network has the advantages of supporting a variety of business, low cost, versatility and good scalability. With the standardization of MPLS protocols and various IPQoS recommendations, Broadband IP will effectively support IP services with quality of service requirements. In order to improve the overall performance of IP network, a variety of new QoS service structure after another. In this paper, by introducing several QoS service models in IP networks, it is emphasized that MPLS is the most promising technology for providing QoS guarantee in large IP networks