Synchronous reluctance motor (SynRM) has the advantages of high efficiency, low cost and simple structure, but the large torque ripple has an effect on its smooth operation. In order to reduce the torque ripple of SynRM, it is necessary to optimize the rotor structure. A 22 kW four-pole SynRM is taken as an example, and Taguchi method is used to optimize the rotor structure of SynRM under different current loads. The rotor topology of SynRM is determined, the influence of key parameters of SynRM rotor structure on torque performance is explored, and the range of key parameters is preliminarily determined. Then, based on Taguchi method, the experimental analysis on motor is conducted under different current loads to obtain the optimal combination of rotor structure parameters, and the finite element simulation is used to verify the optimization results. In order to enhance the mechanical strength of the rotor, a radial magnetic bridge is added to the rotor structure, and the influence of the radial magnetic bridge on the torque performance of the motor is studied.