This paper describes the method of providing different service quality QoS in the integrated service network, and because network applications require different service quality, IETF proposes an integrated service model. Firstly, the three service levels and corresponding service quality of integrated services are described, and then the basic components of the integrated service implementation framework are analyzed: packet classification, scheduling, admission control, packet drop and reservation protocols, including the implementation mechanism of traffic control in routers, and finally the signaling protocol of integrated services, resource reservation protocol, and its support for integrated service QoS are discussed.