An uplink control information, UCI sending method, comprising: receiving (S101), by a terminal device, channel indication information from an access network device on a physical control channel; determining (S102), by the terminal device, a channel resource set of N channel resource sets as a first channel resource set, wherein N is a positive integer greater than or equal to 2, the N channel resource sets are preconfigured by the access network device for the terminal device, and each of the N channel resource sets comprises at least two channel resources, wherein before the determining, by the terminal device, a channel resource set of N channel resource sets as a first channel resource set, the method further comprises: determining, by the terminal device, a size of the UCI, wherein the UCI includes channel state information, CSI; and the determining, by the terminal device, a channel resource set of N channel resource sets as a first channel resource set comprises: determining, by the terminal device, the channel resource set that is of the N channel resource sets and that matches the size of the UCI as the first channel resource set; determining (S103), by the terminal device, a channel resource that is in the first channel resource set and that is indicated by the channel indication information; and sending (S104), by the terminal device, the UCI, to the access network device on the channel resource. receiving (S101), by a terminal device, channel indication information from an access network device on a physical control channel; determining (S102), by the terminal device, a channel resource set of N channel resource sets as a first channel resource set, wherein N is a positive integer greater than or equal to 2, the N channel resource sets are preconfigured by the access network device for the terminal device, and each of the N channel resource sets comprises at least two channel resources, wherein before the determining, by the terminal device, a channel resource set of N channel resource sets as a first channel resource set, the method further comprises: determining, by the terminal device, a size of the UCI, wherein the UCI includes channel state information, CSI; and the determining, by the terminal device, a channel resource set of N channel resource sets as a first channel resource set comprises: determining, by the terminal device, the channel resource set that is of the N channel resource sets and that matches the size of the UCI as the first channel resource set; determining (S103), by the terminal device, a channel resource that is in the first channel resource set and that is indicated by the channel indication information; and sending (S104), by the terminal device, the UCI, to the access network device on the channel resource. determining, by the terminal device, a size of the UCI, wherein the UCI includes channel state information, CSI; and the determining, by the terminal device, a channel resource set of N channel resource sets as a first channel resource set comprises: determining, by the terminal device, the channel resource set that is of the N channel resource sets and that matches the size of the UCI as the first channel resource set; determining (S103), by the terminal device, a channel resource that is in the first channel resource set and that is indicated by the channel indication information; and sending (S104), by the terminal device, the UCI, to the access network device on the channel resource. determining, by the terminal device, the channel resource set that is of the N channel resource sets and that matches the size of the UCI as the first channel resource set; determining (S103), by the terminal device, a channel resource that is in the first channel resource set and that is indicated by the channel indication information; and sending (S104), by the terminal device, the UCI, to the access network device on the channel resource. <EOS>