An automotive head-up display system with an ordinary windshield comprises an ordinary windshield and a display device, wherein the distance between the inner surface and the outer surface of the ordinary windshield is equal across the ordinary windshield, and the inner surface and the outer surface are non-processed and free of any optical film. The display device includes an image source and an optical imaging module. Compared with the traditional technologies, the automotive head-up display system with an ordinary windshield of the invention can effectively solve the ghost/double image problem and reduce the assembling and production costs of the automotive head-up display system without using the wedged windshield or any optical film.