In order to solve the problem that the motor running performance of the axial magnetic field permanent magnet synchronous motor was too high, the rotor of the motor was studied deeply. Firstly, the finite element model of the motor was established by using the finite element analysis software of Maxwell 3D electromagnetic field. The electromagnetic distribution of the motor was simulated and the average eddy current loss was calculated. The eddy current loss of the permanent magnet had been significantly reduced, and the rotor yoke had no harmonics.