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Conventional Direct Torque Control (CDTC) system faces the problems of high flux and torque ripples, and has difficulty in improving the performance of dynamic torque response and control flux locus at very low speed. Under field weakening condition, when the speed is beyond the rated speed, the available power is limited and the speed range cannot be increased any more. A DTC control system based on Fuzzy Logic technology (FL) is proposed. The proposed system aims to make less torque ripples and faster dynamic response than CDTC system by introducing some new fuzzy variables and rescheduling the fuzzy switcher rules. The fuzzy logic control also solved field weakening problem, the speed range can be dramatically increased and the torque ripple when working in field weakening region can be significantly reduced by the proposed technique. We built the system based on matlab, and the simulation results will be analyzed to show the efficiency of the proposed technique.