Permanent magnet synchronous motor (PMSM) direct torque control (DTC) system using fuzzy control to adjust duty ratio of voltage vector is proposed. The applying voltage vector is determined by switching table and the duty ratio of voltage vector is adjusted by fuzzy controller. Simulation results show that, compared with conventional DTC, the proposed fuzzy control system can suppress stator flux and torque ripples. But in the condition of large torque, there will be the torque ripple resulting from the failure of switching table. Aiming at this problem, an improved vector selection control strategy eliminating the switching table is put forward. This control strategy can suppress torque ripple, but its dynamic response is poor. Therefore, an adaptive control strategy is proposed, which uses switching table at the dynamic state and the improved vector selection control at the steady state. Simulation results show that the adaptive control strategy can improve the dynamic response and maintain the steady state performance of the system.