System nodes compose an overlay network through P2P technology, and nodes take advantage of these resources, to build a large-scale, low-cost, high scalability, high reliability, high-performance distributed file sharing system. 系统通过P2P技术将互联网中的节点组成一个覆盖网络,充分利用这些节点资源,构建一个大规模、低成本、高可扩展、高可靠、高性能的分布式文件共享系统。