In order to improve performance of the servo system, a dual-motor anti-backlash algorithm for motor driver working in velocity loop mode is proposed. The certain type microwave weapon servo system is taken as the research object, and the backlash nonlinearity and the principle of dual-motor anti-backlash are analyzed, the mathematical model of dual-motor drive is established, and the control effect of anti-backlash algorithm is simulated and compared based on MATLAB, and the effectiveness of the backlash elimination algorithm is verified on the actual products. The results show that the anti-backlash algorithm is feasible and effective.