To realize the fast and high precision photoelectric reconnaissance for tethered UAV, this paper designs a load control system of photoelectric reconnaissance mission, which using DSP as the control core and three axis fiber optic gyroscope as LOS stabilization. Introduce the buildup, working principle, hardware block diagram, and motor type selection calculation method of the system. A double speed loop control model is adopted to achieve high precision stability control for the system. The results shows that control method of the system have certain engineering reference for improving the stabilization, collimation and tracking of UAVs.