The method includes following steps: when data is needed to transmit, then main board sends control message including attribute information of source file to standby board; receiving the control message, the standby board creates relevant directory and target file, and sends response message to the main board; after receiving the response message, the main board informs FTP module to start transmission for data; dividing source file into multiple blocks, FTP module transmits data blocks to standby board in sequence; when not first data blocks are transmitted, module of adjusting transmission rate determines whether current transmission rate is higher than threshold of current transmission rate; if yes, transmission rate is controlled through delay mode, and then next data block is transmitted; otherwise, next data block is transmitted directly. By adjusting threshold of transmission rate, the invention uses system resources to transmit data effectively, and raises control in real time. |