目的解决目前网络视频系统带宽要求高、系统伸缩性差、大规模用户同时在线时的服务器瓶颈等问题,提出基于P2P流媒体的网络视频系统设计方案。方法将对等网络(P2P)理论应用到流媒体系统中,采用混合网络模式,运用应用层组播技术和区域自治思想构建组播树,根据实际情况对组播树进行动态调整,采用适合的缓存机制实现媒体数据的平稳传输。结果通过对系统设计中的关键技术进行分析,采用P2P流媒体技术的网络视频系统在扩展性、服务器带宽要求、视频播放质量等方面都有了极大的改善。结论在不改变现有网络带宽下,P2P流媒体技术是实现网络视频系统的最佳选择。-Aim To resolve the issues such as the high number bandwidth requirement,poor system scalability and the server bottlenecks of current existing network video system at the same time when the large-scale users online,a design scheme based on P2P streaming is brought forward.Methods Peer-to-peer theory applied to the media streaming system,the system uses a hybrid P2P network model,the multicast tree is build by using application layer multicast and self-governing district mechanism.Multicast tree is dynamical...