The conformal dome has good aerodynamic performance. However, the dynamic aberrations that change with the look angle will be introduced due to the structural characteristics of the conformal dome, resulting in the image quality degradation of the conformal optical system. To solve this problem, a method of suppressing the remaining aberrations of the conformal dome using wavefront coding technique is proposed. The dynamic aberrations of the conformal dome are initially corrected by designing a traditional aspherical fixed corrector, and then a well-designed phase mask is inserted into the exit pupil plane of the conformal optical system to suppress the residual aberrations. The feasibility of this method is verified by PSF, Strehl ratio, and image simulation. The design results show that the method can effectively reduce the number of optical elements and has good aberration elimination effect.