The present disclosure relates to retuning methods and apparatus. One example method includes determining a first resource and a second resource, where the first resource is used to send a SRS, the first resource is determined based on a first frequency domain resource and at least one symbol of a first subframe, the second resource is used to send a PUSCH or a PUCCH, the second resource is determined based on a second frequency domain resource and a second subframe, all or a part of the first frequency domain resource is not in the second frequency domain resource, the first subframe is the first subframe in two consecutive subframes, and the second subframe is the second subframe in the two consecutive subframes, and determining, in at least one of the first subframe or the second subframe, a guard period for retuning.