Abstract: In order to solve the problem of larger projection thickness in optic system, an ultra-short-distance and ultra-wide-angle projection display system was designed by using the method of combining the free-form surface mirror with the aspheric surface. The projection distance was less than 20cm.The color gamut transformation and expansion model of laser and phosphor tricolor was built theoretically, and the real-time processing development hardware system for color transformation was set up using the digital micromirror device (DMD) chip as the spatial light modulator. This system can debug algorithms for varied color system transformations, verify the transformed model and provide a platform for developing specific color transform module.