关键词: 分片并行传输, 通道复用传输, 冗余校验传输, 基于服务质量（QoS）的传输, 自适应

Abstract: Although there already exist many data transfer protocols, they fail to be compatible or compatible well with each other, thus this paper brings forward a creative thinking of making file and file transfer protocol separated, presents a novel structure for adaptive file transfer which supports multiprotocol and three file transfer strategies used in nonlocal network：redundancy check transfer or parallel transfer with file chips is used for large file depending on the file type, transfer based on average quality of service is used for the normal file, and channel multiplexing transfer is used for the small file, besides, transfer based on average quality of service is only used for every file in local network because of the high rate of the file transfer in local network. And on those bases, the algorithm for adaptive file transfer, or the AFTA, is proposed. Experiments indicate that the algorithm can choose a proper protocol according to file’s attributes and other facts, thus it can effectively improve flexibility and efficiency of file transfer, and meanwhile, it ensures the reliability.

Key words: parallel transfer with file chips, channel multiplexing transfer, redundancy check transfer, transfer based on average Quality of Service, adaptive