Traditional model predictive control (MPC) uses all 7 voltage vectors generated by voltage source inverter (VSI) as candidate voltage vectors, which results in heavy calculation burden. But traditional model predictive torque control (MPTC) does not utilize 7 voltage vectors equally under some conditions. The MPTC system for surface permanent magnet synchronous motor (SPMSM) is built. Considering different stator flux sectors, flux and torque control commands and torque angles, the utilization rate of 7 voltage vectors is studied. Based on the principle of utilization rate of voltage vectors, simplified candidate voltage vector sets are proposed which can dynamically adjust candidate voltage vectors. Simulation results show that compared with traditional candidate voltage vectors sets, the proposed sets maintain the performance equivalently and decrease the number of candidate voltage vectors, and therefore can improve the realtime performance of the system.