In this paper, we conduct research on the computer graphics rendering technology based on GPU and parallel computing system. Traditional geometry based on the polygon rendering technique, due to difficulty in modeling and rendering time is too long, has been more and more cannot adapt to the large-scale complex scene accurately modeling and real-time display. On the other hand, with the improvement of image acquisition equipment precision and falling prices is easy to get high precision of image information, based on image rendering technology gradually become one of the main means of scene rendering. Under this basis circumstance we propose the new perspective of the methodology that will optimize the traditional ways and provide systematic modification.