关键词: 对等网络, 服务模型, 性能分析

Abstract: How much service performance of searching and transmitting is provided by P2P network for a concrete resource? How much success ratio and recall ratio of resource’s searching of existing P2P network is?Rare research is deepened about those questions.For unstructured P2P network，thecalculating method of service performance of concrete resource is provided，and the success ratio and recall ratio of resource’s searching are analyzed.It concludes recall ratio of resource’s searching is only related with topology character of P2P network itself，and not related with resource’s quantity.Otherwise，when TTL≥4，mostly searching process can reach higher success ratio and recall ratio.

Key words: Peer-to-Peer, service model, performance analysis