A channel transmission method, a base station, and terminal device are provided. The channel transmission method includes: determining, by a base station, a communication mode to be used between the base station and terminal device; determining, by the base station, a transmission parameter of a first channel according to the determined communication mode, where the communication mode and the transmission parameter of the first channel are in a one-to-one correspondence; and transmitting, by the base station, the first channel to the terminal device.