关键词: P2P，分组，空间查询，空间数据索引

Abstract: This paper put foward a spatial data index based on group chord. At the same time, it provided a kind of spatial ctuery under this index frame and routing recovery. Test results present that this distributed index's maintenance cost is lower. So making using of this index to progress spatial index has scalability. The increase of the size of groups can decrease the query hops. But for the overall spending of this query, there is the most optimized size of group. In addition, this paper also put forward a routing recovery mechanism based on the space-taken, which can deal with the problems of peer failing efficiently and can reinforce the usability of the system as well.

Key words: P2P, Group, Spatial query, Spatial data index