Various embodiments of the present disclosure provide a transmission method, device, and system. The transmission method includes: receiving, by a terminal, a first downlink control channel, determining a first frequency domain resource according to the first downlink control channel, and transmitting a first uplink shared channel on the first frequency domain resource; determining, by the terminal, a sequence length of a pilot of the terminal according to a size of the first frequency domain resource and a mapping interval or a density or a pilot multiplexing factor of each element in a pilot sequence on a frequency domain, and generating the pilot sequence with the sequence length; and determining, by the terminal, a frequency domain starting position of the pilot sequence on the first frequency domain resource, mapping the pilot sequence on the first frequency domain resource for transmitting according to the frequency domain starting position and the mapping interval or the density or the pilot multiplexing factor.