A tag-based file search method was designd for point to point (P2P)system to solve the large consumption of network bandwidth and slow query problem, which determines a way of uploading associated files held by each peer in the bottom layer to subservers in the middle layer and a way of forwarding a query received by the central server in the top layer to an appropriate subserver relevant to the query.A technique of priority sequence of tags was introduced to realize a quick forwarding of queries.The result of performance evaluation indicates that the number of tags which must be examined in forwarding a given query is bounded by a small constant,so as to save network bandwidth and raise the speed of file searching.%针对点对点(P2P)文件搜索技术存在网络带宽消耗大和查询速度慢等问题，为专用的P2P 系统设计一种基于标签的文件搜索方案。该方案给出了将系统底层每个节点所控制的相关文件上传到中间层子服务器，及将顶层中央服务器接收到的文件查询转发到相关子服务器的方法，并运用标签优先顺序技术实现了查询的快速转发。性能评估结果表明，基于标签的文件搜索方法在转发查询过程中，必须检测的标签个数由一个很小的常数界定，从而节省了系统的网络带宽，提高了文件的搜索速度。
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