An embodiment of the invention provides a link self-adaption feedback method. The link self-adaption feedback method comprises that a transmitting terminal device receives a link self-adaption feedback frame sent by a communication opposite terminal, the link self-adaption feedback frame comprises a modulation code request sequence identifier MSI, the MSI is used for sending a link self-adaption request to the communication opposite terminal and indicating space-time code type indication information, the transmitting terminal device performs link self-adaption processing according to the link self-adaption feedback frame, and the transmitting terminal device determines space-time code utilization information of data frames at which the link self-adaption feedback frame aims according to the space-time code type indication information.