A reference signal configuration method, comprising: mapping a phase tracking reference signal, PTRS, to one or more orthogonal frequency division multiplexing, OFDM, symbols based on information about a correspondence between a modulation and coding scheme, MCS, and a PTRS time domain density and information about a correspondence between a scheduled bandwidth and a PTRS frequency domain density; and sending the one or more OFDM symbols to which the PTRS is mapped to a receive device; wherein before the mapping, the method further comprises: preconfiguring or prestoring the information about the correspondence between the MCS and the PTRS time domain density, wherein the PTRS time domain density is used to indicate that one PTRS is mapped to every several OFDM symbols in time domain; preconfiguring or prestoring the information about the correspondence between the scheduled bandwidth and the PTRS frequency domain density, wherein the PTRS frequency domain density is used to indicate that one PTRS is mapped to every several subcarriers in frequency domain; wherein the correspondence between the MCS and the PTRS time domain density is: different MCS intervals correspond to different PTRS time domain densities; wherein the correspondence between the scheduled bandwidth and the PTRS frequency domain density is: different scheduled bandwidth intervals correspond to different PTRS frequency domain densities. mapping a phase tracking reference signal, PTRS, to one or more orthogonal frequency division multiplexing, OFDM, symbols based on information about a correspondence between a modulation and coding scheme, MCS, and a PTRS time domain density and information about a correspondence between a scheduled bandwidth and a PTRS frequency domain density; and sending the one or more OFDM symbols to which the PTRS is mapped to a receive device; wherein before the mapping, the method further comprises: preconfiguring or prestoring the information about the correspondence between the MCS and the PTRS time domain density, wherein the PTRS time domain density is used to indicate that one PTRS is mapped to every several OFDM symbols in time domain; preconfiguring or prestoring the information about the correspondence between the scheduled bandwidth and the PTRS frequency domain density, wherein the PTRS frequency domain density is used to indicate that one PTRS is mapped to every several subcarriers in frequency domain; wherein the correspondence between the MCS and the PTRS time domain density is: different MCS intervals correspond to different PTRS time domain densities; wherein the correspondence between the scheduled bandwidth and the PTRS frequency domain density is: different scheduled bandwidth intervals correspond to different PTRS frequency domain densities. preconfiguring or prestoring the information about the correspondence between the MCS and the PTRS time domain density, wherein the PTRS time domain density is used to indicate that one PTRS is mapped to every several OFDM symbols in time domain; preconfiguring or prestoring the information about the correspondence between the scheduled bandwidth and the PTRS frequency domain density, wherein the PTRS frequency domain density is used to indicate that one PTRS is mapped to every several subcarriers in frequency domain; wherein the correspondence between the MCS and the PTRS time domain density is: different MCS intervals correspond to different PTRS time domain densities; wherein the correspondence between the scheduled bandwidth and the PTRS frequency domain density is: different scheduled bandwidth intervals correspond to different PTRS frequency domain densities. different MCS intervals correspond to different PTRS time domain densities; wherein the correspondence between the scheduled bandwidth and the PTRS frequency domain density is: different scheduled bandwidth intervals correspond to different PTRS frequency domain densities.