As a Multi-media processing chip in possession of rich resource and powerful computing peripherals, DM6446 usually manages effectively the complex resource through an operating system. Since most multimedia applications require a graphical interface, the existing platform operating system is Linux whose kernel and graphical interface is separate, needing to transplant one.and as opposed to Linux, Windows CE itself comes with a GUI, just aquiring a GUI by the development of display driver simply. This paper describes the design and implementation of Windows CE display driver on DM6446.After the system's startup, graphical interface runs stablely, indicating that the driver is fine.