Combining computer-generated holography with liquid crystal spatial light modulator(LC-SLM),a new method for three-dimension reconstruction and real-time display of CT images is proposed. The two-dimension informations of a series of CT images are transformed into three-dimension informations,and a series of different computer-generated holograms which are connected with the number of CT images are obtained by computer. In the process,Fast-Fourier-transform algorithm is used to speed up the calculation by taking full advantage of the characteristic that CT images are digital two-dimension images. The three-dimension digital real-time display system of CT images is set up,in which the traditional holographic plate is replaced by LC-SLM. Controlled by computer,holograms are sent to LC-SLM in sequence,the three-dimensional reconstructed images that change with the holograms are observed,and the real-time display of three-dimensional CT images is realized.