The method includes steps: (1) After orthogonal and frequency-division multiplex process, data are sent from the sending end (SE) to the receiving end (RE); (2) RE receives data, estimates channels, de-modulates, decodes and sends ACK/ NACK and the position info of the re-sending data block to SE; (3) SE continues to send the new data after receiving ACK; (4) After receiving NACK, SE ascertains the data block which needs to be re-sent, then accumulates the number of re-sent data blocks. If this number is not larger than the max re-sent number, SE re-sends this data block. Otherwise, SE waives this data block and starts to send the new data of the next frame; (5) after receiving the re-sent data block, RE combines these data with the data received before and decodes them, then feedbacks a info to SE, then repeats steps (3) and (4). The invention raises re-sent efficiency, frequency utility and the system throughput.