中文摘要：

针对当前P2P地理信息系统（GIS）在客户端网络资源利用方面的不足，从应用实际出发，对已有的混合结构P2P空间索引网络进行分析总结，提出一种新的组策略思想：将具有相同空间数据语义的节点加入到同一组中，由组中成员节点共同负担查询请求任务；同时，通过当前索引节点的替换算法和备份策略进一步提高整个网络的查询性能和稳定性。实验结果表明，在大并发量查询请求时有组策略的索引网络能够有效利用客户端的网络资源，提高查询性能。

英文摘要：

In allusion to the insufficiency of current P2P Geographic Information System （GIS） in utilizing network resources of clients, based on analyzing and summarizing the existing hybrid P2P spatial indexing network, a new idea of group strategy was proposed in view of practice. In this idea, peers with the same spatial data semantics were joined in the same group in which the burden of query was shared by group members together. Furthermore, a replacement algorithm of current index nodes and backup strategy were proposed to improve the query performance and stability of the overall network. The experimental results indicate that the indexing network with group strategy can effectively make use of clients＇ network resources and improve the query performance when a large number of queries request concurrently.