1.现有P2P文件共享系统的简介 2.P2P文件共享系统的三个主要问题:搜索与定位，数据传输，信誉、激励及安全相关问题 3.现在研究问题的总结 4.P2P文件共享系统测量的相关工作-1. Existing P2P file-sharing system profile file-sharing system 2.P2P three main issues: the search and location, data transmission, reputation, motivate