In order to achieve a real-time and visual observation of multi-plane images, a method using light-emitting materials is proposed. A 3D object can be divided into a series of 2D slices along the optical axis. With an efficient and fast 3D Gerchberg-Saxton algorithm, a computer-generated phase hologram is obtained and a numerical reconstruction is carried out on the computer. The process of 3D Gerchberg-Saxton algorithm is expounded, and the experiment for reconstruction and visualization of multi-plane images based on LC-SLM is conducted. With the grey level-phase curve of the LC-SLM, the computer-generated phase hologram is converted to gray-scale hologram, which is loaded to the LC-SLM to reconstruct the 3D light fields. The fluorescence characteristic of quantum dot materials is used to achieve the visualization of the light fields. Experimental results show that the optical reconstruction is in good agreement with numerical simulation. This technique is applicable in medicine, military, 3D display, micromachining and micro-technology.