Example hybrid automatic repeat request (HARQ) feedback methods and apparatus are provided. One example method includes a network device obtains first indication information used to instruct a terminal device to feed back HARQ feedback information. The first indication information is obtained based on information amounts corresponding to a data channel and/or information amounts corresponding to a control channel that are in a reference slot and at least one first slot. The reference slot and the at least one first slot each correspond to a different component carrier of a plurality of component carriers serving the terminal. The reference slot and the at least one first slot have a same start moment, and at least two of the plurality of component carriers have different slot lengths. The network device sends, to the terminal device, indication information used to indicate at least the first indication information.