In order to improve the stability control accuracy of airborne electro-optical platform for Unmanned Aerial Vehicles (UAVs), a kind of cascade stability control method based on double speed-loop was designed in consideration of the low disturbance rejection performance of single speed-loop control.The double speed-loop structure was constructed by using the velocity gyroscope to form the inner loop, and the optoelectronic encoder to form the outer loop. Theoretic analysis and experiments were carried to the single/double-loop structures on their disturbance rejection performance, robustness and dynamic response performance.The results showed that the double speed-loop structure is more robust and has better performance on disturbance rejection and dynamic response.The method can effectively improve the stability control accuracy of the electro-optical platform mounted on UAVs.