Numerical control (NC) machining is an effective method for soluting the problem of aspheric machining. For the application of aspherical lens in large solid-state laser system , a novel method via ultra-precision grinding has been proposed to shape the hard-brittle material with high accuracy and efficiency. To improve the machining quality and efficiency, the machining experiments are carried out to find the influence of grinding depth and feeding speed on surface quality. The subsurface defects have been effectively restrained by adopting the larger grinding depth and smaller feeding speed. And the compensation machining is also investigated. The compensation machining with equal profile error curve can reach fine surface with less than 3-microns error in peak-valleyy (PV) values for 330 mm×330 mm aspherical lens.