A method of performing a beamforming in a base station of a wireless communication system according to one embodiment of the present invention may include determining an effective range of an analog beam based on a gain of an analog beam-forming in a hybrid beamforming, determining a precoding matrix for a digital beamforming in the hybrid beamforming based on the effective range of the analog beam, and performing the hybrid beamforming having the digital beamforming and the analog beam-forming coupled therein based on the effective range and the precoding matrix.