Aiming at the problem that the unmanned aerial vehicle (UAV) position deployment is highly related to hybrid beamforming, this paper proposes a method based on step-by-step optimization to maximize the total transmission rate of the system. First, the digital beamforming is used to obtain the simplest objective function, and a virtual channel is introduced to solve the optimal position of the UAV deployment. Then, the optimal deployment position of the UAV is substituted into the optimization problem of the offset angle of the phase shifter in the analog beamforming, and the traditional artificial fish swarm algorithm is used to effectively solve the optimal analog beamforming matrix. Finally, the limited resolution of the phase shifter is solved with an improved artificial fish swarm algorithm. The simulation results show that, compared with the existing methods, the method has better performance in location deployment and maximizing the total transmission rate of the system.