This invention provides a transmission method, devices and data exchange device for high speed data flows, in which, the method includes: A, receiving a high speed data flow and adding sequence number for every packet according to the receiving order and distributing the packets and the sequence numbers to N parallel transfer channels, among which, N is greater or equal to 2, B, utilizing the channels to transmit said data packets and the numbers, C, receiving the data packets and the numbers and sequencing the packets to turn them into a high speed data flow and output, which realizes high speed single flow line speed transfer by distributing data packets and re-sequence.