Traditional mechanical fault diagonal methods using vibration metrics face many difficulties in theapplication of the wind turbine generator due to complicated operation environments. Therefore，in this paper，weadopt the innovative approach based on the technology of wireless sensor diagnosis. We investigate into how the electric current in the motor stator reacts to the mechanical faults from components such as gears and bearings by using advanced signal process and simulations techniques. This paper also summarizes some experience in how topreprocess the minor mechenical faults information and its feasibility as well as prospects in the fault diagnosis ofwind turbine drive train system.