关键词: 对等网络, 文件分发, 阻塞算法, 自适应

Abstract: The BitTorrent file distribution system mainly uses tit-for-tat choking algorithm as peer selection method.But the choking algorithm results in too long waiting time between new interacted peers and deficient uploading links before completing all the blocks.Therefore，an adaptive choking algorithm is proposed，in which peers create additional uploading links when there are a few uploading links.Experimental results show that，the adaptive algorithm can effectively decrease peer waiting time，increase the number of uploading links，facilitate the rate of peer’s retrieving the first block in order to enhance the file distribution performance of BitTorrent systems.

Key words: peer-to-peer network, file distribution, choking algorithm, adaptive