As an ideal 3D display way, holographic 3D display can present the same information of depth and parallax as real objects. However, the computer-generated hologram for a 3D object has to do complex and massive computations, how to create a computer-generated hologram quickly for the 3D object has become a key problem in the digital holographic 3D display technique. In this paper, the key techniques of digital holographic 3D display are discussed firstly, including three kinds of methods for creating computer-generated holograms like object point scattering, holographic stereograms and holographic tomography, a RGB separating method for colorful holographic 3D display, and several kinds of improving quality methods for reconstructed images. Then, few latest holographic 3D display systems and key devices are analyzed technically. Finally, it summarizes the present state of the digital holographic 3D display technique and points out that the technology will develop to real-time, dynamics, larger sizes and higher resolution.%三维全息显示能够表现出与真实物体一样的深度和视差,是一种理想的三维显示方法.但是,三维物体计算全息图计算复杂且计算量巨大,因此,如何快速生成三维物体计算全息图是数字三维全息动态显示中的关键问题之一.本文首先论述了数字全息三维显示的关键技术,包括物点散射法、体视全息法、层析法等三种三维物体计算全息图实现方法,一种RGB分离的真彩色全息显示实现方法和若干提高全息再现像质的方法；然后对几种最新典型的数字三维全息显示系统进行了技术分析;最后总结了数字全息三维显示领域的发展动态,指出三维全息显示技术会朝着实时、动态、更大尺寸、更高分辨率方向发展.
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