To correct the static and dynamic aberrations introduced by a toroidally shaped conformal window on an aircraft across the full field of regard,a static corrector configuration was designed. The corrector is composed of three tilted and decentered elements with rotationally symmetric structures,and the surface of each element is aspheric. The corrector is fixed in position relative to the conformal window and its structure is compact and stable. Based on the vector aberration theory,the optical design of the corrector was presented and the aberration correction principle of the corrector was explained. The results show that,at any field of regard angle,the vectorial astigmatism introduced by the conformal window and the corrector are offseted mutually,and the static and dynamic astigmatism introduced by the conformal window across the full field are corrected. The wavefront aberration of the conformal optical system is less than one wavelength at the visible spectrum,and the modulation transfer function values of the system are above 0.8 at 50 lp/mm.