Different from the pseudo three-dimensional (3D) visualization of computer tomo graphy (CT) images synthesized by computer softwares,a new technology of 3D visu alization of color CT images based on computer generated holography is proposed.A set of color CT images are decompos ed into three primary color CT images of red,green and blue,then,the two-dimension information of this set of color CT images is synthesized into 3D information using three computer generated holograms (CGHs) w hich are saved in a computer. Because all CT images are two-dimension,fast-Fourier-transform algorithm that can greatly speed up the calculation of CGHs is adopted.3D photoelectric display system of color CT images is set up,in which,three CGHs are displayed on three liquid crystal spatial light modulators (LC-SLM) connect ed to a computer.Re-illuminating the three CGHs with red,green and blue laser simultaneously,three 3D monochrome CT images of three primary colors are obtained,and a 3D color CT image is gotten by fusing the three 3D monochrome CT images together with X-Cube.A fog screen is used in this system as the 3D display screen for the final 3D color CT image,that not only increases the visual angle,but also enhances the stereoscopic effects of the 3D color CT image.The principle and experimental result are given.