High-level data link control data sending method

The invention provides an HDLC resending method. The HDLC resending method is applied to a sending terminal. According to the HDLC resending method provided by the invention, when the sending terminal is used for sending a data packet, an added header contains a packet sending sequence and a packet sending type and is used for sending the data packet by virtue of HDLC; when receiving a resending command, the sending terminal directly acquires a data packet to be resent according to the resending command and resends the data packet without judging whether the resending is needed or not, and thus occupied time of the resending process to the sending terminal is shortened, and the speed of sending data by the sending terminal is not influenced. In addition, with the adoption of the HDLC resending method, the packet sending sequence and the packet sending type are added in the data packet only without changing an HDLC chip, and thus the cost of the HDLC can not be increased.