The embodiment of the invention discloses a file transmission path selection method for a P2P (peer-to-peer) network and the method comprises determining a non-direct connection path between source notes and target notes, determining the correlation between the non-direct connection path and a direct connection path which is the path between the source notes and the target notes, according to the correlation result determined, selecting one or a plurality of paths from the non-direct connection paths as the paths for transmitting files to the target nodes. The embodiment of the invention also provides a file transmission path selection system and a device for the P2P (peer-to-peer) network. The method of the invention can be used for effectively increasing the throughput rate of file transmission business, reliability and stability.