Data-sharing in P2P has become a hot research topic as well as in application system, especially after its successful application on those popular P2P system such as Napster,Freenet and Gnutella etc.

• 最近一段时间,由于许多Peer-to-Peer(简写为P2P)系统例如Napster、Freenet和Gnutella等的成功应用,P2P数据共享问题成为国际上应用领域和研究领域内的热点。