A data transmission method, comprising: receiving, by a receiving device , first data on a first time-frequency resource, and receiving second data on a second time-frequency resource; and when the first time-frequency resource and the second time-frequency resource have an overlapped target frequency domain resource in frequency domain, using, by the receiving device, a first DMRS mapped to a target frequency domain resource of the first time-frequency resource to demodulate the second data mapped to a target frequency domain resource of the second time-frequency resource, wherein the using, by the receiving device , a first DMRS to demodulate the second data mapped to a target frequency domain resource of the second time-frequency resource comprises: when a spacing satisfies a relationship with a preset spacing, and the first time-frequency resource and the second time-frequency resource have an overlapped target frequency domain resource in frequency domain, using, by the receiving device , the first DMRS to demodulate the second data mapped to the target frequency domain resource of the second time-frequency resource, wherein the spacing is a spacing between the first time-frequency resource and the second time-frequency resource, and wherein the preset spacing is determined based on a moving speed of the terminal device and a channel time variant parameter of the terminal device. receiving, by a receiving device , first data on a first time-frequency resource, and receiving second data on a second time-frequency resource; and when the first time-frequency resource and the second time-frequency resource have an overlapped target frequency domain resource in frequency domain, using, by the receiving device, a first DMRS mapped to a target frequency domain resource of the first time-frequency resource to demodulate the second data mapped to a target frequency domain resource of the second time-frequency resource, wherein the using, by the receiving device , a first DMRS to demodulate the second data mapped to a target frequency domain resource of the second time-frequency resource comprises: when a spacing satisfies a relationship with a preset spacing, and the first time-frequency resource and the second time-frequency resource have an overlapped target frequency domain resource in frequency domain, using, by the receiving device , the first DMRS to demodulate the second data mapped to the target frequency domain resource of the second time-frequency resource, wherein the spacing is a spacing between the first time-frequency resource and the second time-frequency resource, and wherein the preset spacing is determined based on a moving speed of the terminal device and a channel time variant parameter of the terminal device. when a spacing satisfies a relationship with a preset spacing, and the first time-frequency resource and the second time-frequency resource have an overlapped target frequency domain resource in frequency domain, using, by the receiving device , the first DMRS to demodulate the second data mapped to the target frequency domain resource of the second time-frequency resource, wherein the spacing is a spacing between the first time-frequency resource and the second time-frequency resource, and wherein the preset spacing is determined based on a moving speed of the terminal device and a channel time variant parameter of the terminal device. <EOS>