基于纯相位空间光调制器的计算全息显示系统的大尺寸再现，可从理论算法和实验光路两方面实现。在分析了计算全息成像原理的基础上，提出了利用傅里叶变换的相似性定理扩大再现像尺寸的方法，从理论上实现了再现物体频域到空域的可调节再现像尺寸的计算全息再现，并搭建了基于空间光调制器的实验平台，验证了再现像尺寸在原基础上扩大2.7倍后亦可清晰再现。在此基础上，利用相移原理，一定程度上实现了中央零级光斑的抑制。实验结果表明，该理论可有效实现计算全息再现像的放大，并在相移原理的辅助下得到不受中央零级影响的清晰再现像。

The enlargement of reconstructed image of computer generated hologram (CGH) display system based on phase-only special light modulator (SLM) can be realized by theoretical algorithm and experiment. Based on analysis of the theory of CGH, the method to enlarge the size of reconstructed picture by similarity principle of Fourier transform is proposed, and the adjustable reconstructed image size of CGH from frequency domain to space domain is achieved. It′s confirmed that the reconstructed image which is two to three times bigger than before can be displayed clearly by the experimental platform based on SLM. The suppression of zero-order bright spot is realized in some degree base on phase shift theory. The experimental results show that this theory can realize to enlarge the reconstructed image effectively, and get clear reconstructed image without the effect of zero-order bright spot under the help of phase shift theory.