A method for sending a sounding reference signal SRS, comprising: receiving, by a terminal device (102, 103), a first configuration information of an SRS resource of a first slot from a network device, wherein the SRS resource is an aperiodic SRS resource, the first configuration information comprises a repetition factor L r of the SRS resource, and the first configuration information indicates that the SRS resource consists of four OFDM symbols: determining, by the terminal device (102, 103) based on the first configuration information of the SRS resource and the first slot, a count n SRS of positions for SRS sending, and determining, by the terminal device (102, 103) based on the n SRS, frequency domain resources to which the SRS resource is mapped in the first slot; and the n SRS is associated with the frequency domain resource of the four OFDM symbols; wherein the n SRS represents a count of positions at which the SRS resource is transmitted on a same subcarrier and continuous symbols that satisfies: n SRS = ⌊ l ′ / L r ⌋ wherein l' represents a difference between a symbol number of the four OFDM symbols in the first slot and a starting symbol number of the SRS resource in the first slot, l' =0, 1, 2, or 3, L r = 2, and the starting symbol of the SRS resource in the first slot is in the last 6 OFDM symbols of the first slot; sending, by the terminal device (102, 103), the SRS to the network device on the determined frequency domain resources. receiving, by a terminal device (102, 103), a first configuration information of an SRS resource of a first slot from a network device, wherein the SRS resource is an aperiodic SRS resource, the first configuration information comprises a repetition factor L r of the SRS resource, and the first configuration information indicates that the SRS resource consists of four OFDM symbols: determining, by the terminal device (102, 103) based on the first configuration information of the SRS resource and the first slot, a count n SRS of positions for SRS sending, and determining, by the terminal device (102, 103) based on the n SRS, frequency domain resources to which the SRS resource is mapped in the first slot; and the n SRS is associated with the frequency domain resource of the four OFDM symbols; wherein the n SRS represents a count of positions at which the SRS resource is transmitted on a same subcarrier and continuous symbols that satisfies: n SRS = ⌊ l ′ / L r ⌋ wherein l' represents a difference between a symbol number of the four OFDM symbols in the first slot and a starting symbol number of the SRS resource in the first slot, l' =0, 1, 2, or 3, L r = 2, and the starting symbol of the SRS resource in the first slot is in the last 6 OFDM symbols of the first slot; sending, by the terminal device (102, 103), the SRS to the network device on the determined frequency domain resources. determining, by the terminal device (102, 103) based on the first configuration information of the SRS resource and the first slot, a count n SRS of positions for SRS sending, and determining, by the terminal device (102, 103) based on the n SRS, frequency domain resources to which the SRS resource is mapped in the first slot; and the n SRS is associated with the frequency domain resource of the four OFDM symbols; wherein the n SRS represents a count of positions at which the SRS resource is transmitted on a same subcarrier and continuous symbols that satisfies: n SRS = ⌊ l ′ / L r ⌋ wherein l' represents a difference between a symbol number of the four OFDM symbols in the first slot and a starting symbol number of the SRS resource in the first slot, l' =0, 1, 2, or 3, L r = 2, and the starting symbol of the SRS resource in the first slot is in the last 6 OFDM symbols of the first slot; sending, by the terminal device (102, 103), the SRS to the network device on the determined frequency domain resources.