A device using a low-cost plastic curved mirror and several combinations of methods for reducing aberrations to improve a real image projection system is provided, so as to reduce ghost and astigmatism phenomenon. The real image projection system includes a curved mirror having two different optical surfaces of revolution, one on a convex surface and the other on a concave surface. The real image projection system may include at least a curved reflector positioned in a tilted configuration, and an optical axis of the reflector does not coincide with a viewing axis. A beampath between a target source and the curved reflector neither passes through a beamsplitter nor is reflected thereby. The real image projection system may further include a circular polarizer for circularly polarizing a light beam in a primary light path between the mirror and the real image, eliminating ghost image caused by outside light sources.