Heavy load has two main impacts on the shipborne optical-electric platform. The first one is the decrease of the resonance frequency, narrowing the bandwith of the system, and the second one is the increase of the disturbance. To ensure the precision of stabilization, it needs to improve the torque rigidity of the system and compensate the disturbance. A method is proposed which adds the current loop into the closed speed loop formed by the tachometer, and uses the gyro to get the feedforward compensation of the angular speed, and uses an observer to restrain the disturbance. The theory and simulation results demonstrate that the current loop can enlarge the torque rigidity of the system, the gyro feedforward can improve the isolation of the ship-sway, and the disturbance observer can greatly compensate the disturbance. The method enhances one magnitude for the stability, and provides an instruction for the engineering practice.