A beamforming method of millimeter wave communication is introduced herein. the beamforming method is adapted to a base station and includes following steps. A plurality of periodic signals are transmitted by using a frame header of M radio frames via Q base station beams designated as Q scan beams while performing a network entry, wherein M≥1 and Q≥1. Data packets are transceived by using a payload region of the M radio frames via at least one scheduled beam while a user equipment connection is performed via the scheduled beam selected from the Q base station beams.