As the high speed non-salient pole synchronous generator electromagnetic vibration was prominent, the air gap magnetic field and the radial electromagnetic force wave of the synchronous generator were analyzed and calculated by the finite element method.The influence of different magnetic permeability slot wedges and different number of slots on the electromagnetic vibration force of the motor was studied and summarized, and the optimization scheme of reducing the electromagnetic vibration was formed.The correctness of the analysis and calculation of the radial electromagnetic force wave was verified by the comparison of the vibration frequency of the motor foot and the electromagnetic vibration force wave spectrum.On the basis of this, the electromagnetic vibration under the optimization scheme was estimated, the rotor tooth harmonic acceleration was reduced by 13.5 dB and the total vibration level was reduced by 4.6 dB, and the validity of the optimization scheme is verified. The relevant analytical method and optimization measure provided a reliable reference for suppressing the electromagnetic vibration of the high speed generators.