中文摘要：

P2P应用软件主要包括文件分发软件、语音服务软件、流媒体软件。目前P2P应用种类多、形式多样，没有统一的网络协议标准，其体系结构和组织形式也在不断发展。P2P应用已占运营商业务总量的60％～80％，P2P应用所产生的流量具有分布非均衡、上下行流量对称、流量隐蔽、数据集中等特性。在P2P技术的发展道路上，有许多尚待解决的问题。版权问题一直是P2P发展的一个不确定因素，如何在技术层面支持合法文件的分发是需要解决的重要问题。安全问题也是P2P领域的重要研究课题，如何在P2P网络中实现数据存取安全、路由安全、用户身份认证和身份管理都需要进一步研究。此外，如果能够实现P2P应用之间的统一资源定位，统一路由，使得P2P技术有一个统一开发标准，那么就能够融合P2P技术，提升P2P应用的整体性能。

英文摘要：

P2P application softwares include file delivery software, Voice over IP （VolP） software, and streaming media software. Because of its various applications, there is still no formed standard for P2P network protocol. The architecture and organization of P2P are also constantly developing. However, network traffic generated by P2P takes a considerable 60%-80% of total traffic. The P2P traffic has the properties of imbalanced distribution, symmetric uploading and downloading, concealment flow, and data concentration. There are many open questions in P2P technology. Firstly, the copyright question is always an uncertainty factor for the development of P2P. Supporting the delivery of legal files at a technical level is an important problem that should be solved. Secondly, security, such as data access security, security routing, account authentication and identity, is another field which should be seriously considered. Moreover, if the uniformed resource location and uniformed routing between P2P applications are realized to form a uniformed development standard, all P2P technologies can be integrated, and the entire performance of P2P applications will improve.