A signal sending method, comprising: Receiving, by a base station, an uplink pilot signal sent by authorized user equipment, and determining a direction vector parameter and a first channel fading parameter of a channel according to the uplink pilot signal, wherein the direction vector parameter is used for receiving a secrecy signal by the authorized user equipment, and the channel is used for transmitting the secrecy signal; calculating, by the base station according to the direction vector parameter and the first channel fading parameter, a first signal beamformer parameter used for transmitting the secrecy signal, wherein the first signal beamformer parameter can enable energy leakage of the secrecy signal transmitted by the base station to be less than a first threshold, and enable a signal to interference plus noise ratio of the secrecy signal received by the authorized user equipment to be greater than a second threshold; determining, by the base station, a transmission area of an artificial noise signal according to the direction vector parameter, and calculating, according to the direction vector parameter, a second signal beamformer parameter used for transmitting the artificial noise signal, wherein the second signal beamformer parameter can enable interference caused to the authorized user equipment by the artificial noise signal transmitted by the base station to be less than a preset threshold, enable a signal to interference plus noise ratio of the artificial noise signal received by unauthorized user equipment in the transmission area to be less than a third threshold, and enable a sum of transmit power of the artificial noise signal and transmit power of the secrecy signal to be less than preset transmit power; and processing, by the base station, a to-be-transmitted signal by using the first signal beamformer parameter and the second signal beamformer parameter, and transmitting the processed signal. Receiving, by a base station, an uplink pilot signal sent by authorized user equipment, and determining a direction vector parameter and a first channel fading parameter of a channel according to the uplink pilot signal, wherein the direction vector parameter is used for receiving a secrecy signal by the authorized user equipment, and the channel is used for transmitting the secrecy signal; calculating, by the base station according to the direction vector parameter and the first channel fading parameter, a first signal beamformer parameter used for transmitting the secrecy signal, wherein the first signal beamformer parameter can enable energy leakage of the secrecy signal transmitted by the base station to be less than a first threshold, and enable a signal to interference plus noise ratio of the secrecy signal received by the authorized user equipment to be greater than a second threshold; determining, by the base station, a transmission area of an artificial noise signal according to the direction vector parameter, and calculating, according to the direction vector parameter, a second signal beamformer parameter used for transmitting the artificial noise signal, wherein the second signal beamformer parameter can enable interference caused to the authorized user equipment by the artificial noise signal transmitted by the base station to be less than a preset threshold, enable a signal to interference plus noise ratio of the artificial noise signal received by unauthorized user equipment in the transmission area to be less than a third threshold, and enable a sum of transmit power of the artificial noise signal and transmit power of the secrecy signal to be less than preset transmit power; and processing, by the base station, a to-be-transmitted signal by using the first signal beamformer parameter and the second signal beamformer parameter, and transmitting the processed signal.