Multifocal intraocular lenses which mainly include diffractive type and refractive type can provide patients with good vision in varius distances. But they also result in image quality reducing. This article suggest a new design method of aspherical intraocular lens. In this method, when pupil is lager, the dominant eye will keep a better vision of far distance, at the same time, get vision of near distance; or make the undominant eye keep a better vision of near distance and get vision of far distance. When two eyes observe objects of different distance, good binocular vision will always be gained and the visual ability of both eyes will not be influenced. We will also report the ZEMAX raytracing results on model eyes which consist of aspherical cornea and nature lens, and the optimized results based on the balance of binocular vision.