We describe a prototype of a full color 3D video system. The system is composed of a color liquid crystal display (LCD) panel and a special grating array, which are illuminated with a white light source. In 1995, we have proposed a method for a 3D display video system using Grating Image technique. The system is composed of an LCD and a diffraction grating array. The system can construct 3D images in real time which can be seen without any special glasses. However, the 3D images formed by the conventional system are monochromatic images. In this paper, we propose the development of a full color 3D-video system using grating image technique.