Embodiments of the present invention relate to a transmission method using a dynamically adjusted beam set, a base station, and a terminal. The method includes: sending, by the base station, first indication information to a terminal using first layer signaling, where the first indication information indicates a first beam set; sending, by the base station, second indication information to the terminal using second layer signaling, where the second indication information indicates at least one beam in the first beam set; and sending, by the base station, data to the terminal using the at least one beam.