This paper discusses the quality of service,QoS,defined by ISO OSI,CCITT and ATM in detail. The QoS strategy of IPv6 protocol in Internet is presented in this paper.

• 该文详细给出了 ISO OSI、CCC和 ATM服务质量（Quality of Service，QoS）的概念，介绍了 Internet IPv6对QoS的控制机制。