A View of P2P File-Sharing Service

File-sharing is the major application of P2P Network, it is the resource sharing demand that directly led to the generation of P2P technology and development boom. Worldwide, BT and eMule has always been the mainstream system in the field. But in China, P2SP service providers with thunder as the representative rise rapidly, and open up the market with a so-called intelligent resource selection technology, and already share more than 70% the market from 2007 up to now. The main work of this paper includes the study of P2P and P2SP network characteristics, as well as the research of the characteristics of resource sharing application based on user behavior of two networks.