In order to improve the capability of propeller driving force of FL-12 wind tunnel, a propeller driving force test system is developed in the FL-12 wind tunnel. This system is mainly used for the simulation of propeller slipstream features and the asymmetric aerodynamic characteristics. This paper mainly introduces the system composition and the system design, the ground debugging results are analyzed at the same time. The results show that the system has greatly improved the speed control accuracy and the degree of system automation, and some technical indexes have reached the international advanced level.