In conventional drilling operation, toolface drifting will be easily happened when adopting down-hole-bend deflecting motor in steering drilling section, and it can trigger some problems such as control failure in borehole trajectory. For this problem, a dynamic control method for the down-hole directional motor toolface is needed urgently. This paper develops an accurate control method for the rotation angle of asynchronous motor. The method which adopts Fuzzy control combined with vector control technology for accurate positioning control is analyzed through MATLAB/Simulink, and tested at SINAMIC S120. The simulation and experimental results show that the control algorithm presented in this paper can achieve the accurate positioning of motors, and the control system has high control accuracy, fast dynamic response characteristics. Top drive system or rotary table combined with this kind of motor lays a solid foundation for achieve the accurate control over the down-hole-motor toolface at the well site.