In a channel state information receiving method, a base station sends first signaling to a terminal device. The first signaling includes sounding reference signal (SRS) information of each of a plurality of subbands. The SRS information of each subband comprises at least one of: a period of an SRS in the subband, a starting position of the SRS in the subband, an offset position of the SRS in the subband, and a port number of the SRS in the subband. The base station receives an SRS in at least one of the plurality of subbands. The base station measures the SRS to obtain channel state information, where the channel state information is obtained by measuring the CSI-RS sent in the at least one subband.