A transmission method, applied to a first communication device, characterized by comprising: transmitting a target reference signal that belongs to a first type of reference signal in a case that indication information from a second communication device is received and indicates transmission of the first type of reference signal, wherein, a reference signal sequence of the first type of reference signal is generated based on a first characteristic, wherein in a case that the first type of reference signal occupies 12 subcarriers, the reference signal sequence comprises at least one of the following sequences: 101101001011, 110010101001, 110110101000; in a case that the first type of reference signal occupies 18 subcarriers, the reference signal sequence comprises at least one of the following sequences: 010101110010110110, 010110110001101011, 110100101010011110; and, in a case that the first type of reference signal occupies 24 subcarriers, the reference signal sequence comprises at least one of the following sequences: 011001001111110111101101, 100111110110111011000111, 101011011001111100110111, 101111111110100111001101, wherein the first characteristic comprises at least one of the following: that an auto-correlation shift mean of a first reference signal symbol of the target reference signal falls within [0, 0.2]; that cross-correlation values of first reference signal symbols of all reference signals in a reference signal group corresponding to the first type of reference signal fall within [0, 0.2]; that a peak-to-average power ratio, PAPR, value of reference signal symbols of the target reference signal falls within [0 dB, 1.3 dB]; that a minimum value of a modulus of a second reference signal symbol of the target reference signal is greater than 0.1; and that a difference between a signal-to-interference-plus-noise ratio, SINR, value corresponding to a first value of a block error rate, BLER, of the target reference signal, and a mean value of SINR values corresponding to first values of BLERs of all reference signals in a reference signal group corresponding to the first type of reference signal falls within [-0.5 dB, 0.5 dB]. transmitting a target reference signal that belongs to a first type of reference signal in a case that indication information from a second communication device is received and indicates transmission of the first type of reference signal, wherein, a reference signal sequence of the first type of reference signal is generated based on a first characteristic, wherein in a case that the first type of reference signal occupies 12 subcarriers, the reference signal sequence comprises at least one of the following sequences: 101101001011, 110010101001, 110110101000; 101101001011, 110010101001, 110110101000; in a case that the first type of reference signal occupies 18 subcarriers, the reference signal sequence comprises at least one of the following sequences: 010101110010110110, 010110110001101011, 110100101010011110; and, 010101110010110110, 010110110001101011, 110100101010011110; and, in a case that the first type of reference signal occupies 24 subcarriers, the reference signal sequence comprises at least one of the following sequences: 011001001111110111101101, 100111110110111011000111, 101011011001111100110111, 101111111110100111001101, 011001001111110111101101, 100111110110111011000111, 101011011001111100110111, 101111111110100111001101, wherein the first characteristic comprises at least one of the following: that an auto-correlation shift mean of a first reference signal symbol of the target reference signal falls within [0, 0.2]; that cross-correlation values of first reference signal symbols of all reference signals in a reference signal group corresponding to the first type of reference signal fall within [0, 0.2]; that a peak-to-average power ratio, PAPR, value of reference signal symbols of the target reference signal falls within [0 dB, 1.3 dB]; that a minimum value of a modulus of a second reference signal symbol of the target reference signal is greater than 0.1; and that a difference between a signal-to-interference-plus-noise ratio, SINR, value corresponding to a first value of a block error rate, BLER, of the target reference signal, and a mean value of SINR values corresponding to first values of BLERs of all reference signals in a reference signal group corresponding to the first type of reference signal falls within [-0.5 dB, 0.5 dB]. that an auto-correlation shift mean of a first reference signal symbol of the target reference signal falls within [0, 0.2]; that cross-correlation values of first reference signal symbols of all reference signals in a reference signal group corresponding to the first type of reference signal fall within [0, 0.2]; that a peak-to-average power ratio, PAPR, value of reference signal symbols of the target reference signal falls within [0 dB, 1.3 dB]; that a minimum value of a modulus of a second reference signal symbol of the target reference signal is greater than 0.1; and that a difference between a signal-to-interference-plus-noise ratio, SINR, value corresponding to a first value of a block error rate, BLER, of the target reference signal, and a mean value of SINR values corresponding to first values of BLERs of all reference signals in a reference signal group corresponding to the first type of reference signal falls within [-0.5 dB, 0.5 dB].