A new technology of three-dimension visualization of computer tomograms using computer generated holography is proposed. Firstly, information amalgamation of computer tomograms is studied, the three-dimension information extracted from a series of two-dimension computer tomograms is recorded by computer-generated holography, and different Computer-generated Holograms(CGHs) corresponding to different number of computer tomograms are obtained. Then, combining the structural features of Liquid Crystal Spatial Light Modulator (LC-SLM), spatial frequency, angle between object and reference beams as well as sample interval of CGHs is analyzed, and the viewing angle of reconstructed image of CGHs is discussed. On this basis, relevant parameters are properly set making the holographic system and the liquid crystal display system match well. Finally, three-dimensional reconstructed and real-time display system for computer tomograms is build, in which, real-time controlled by computer, different CGHs are output to LC-SLM in sequence, and three-dimensional reconstructed images of computer tomograms changing with the holograms are dynamically displayed on fog screen. The principle and experiment result are given.