Abstract: This paper advances the grid system based on peer-to-peer (for short P2P) virtual community, according to small world property and power law property of P2P network. It divides grid system into P2P virtual community based on the definition of virtual community, and designs the routing algorithm of virtual community. It verifies the routing algorithm by simulation experiment.

Key words: Peer-to-Peer (P2P), Grid, Virtual community, Routing algorithm, Small world property

摘要： 依据对等网络所具有的小世界特性和幂律分布特性的理论基础，提出了基于对等虚拟社群的网格系统。在定义了虚拟社群的基础上，将网格系统划分为对等的虚拟社群，设计了基于对等虚拟社群的路由算法。通过仿真实验对路由算法进行了验证。

关键词: 对等网络, 网格, 虚拟社群, 路由算法, 小世界现象