Holographic display technology has developed rapidly recently. Base on the diffraction theory and with the help of MATLAB software,we obtained the corresponding phase hologram,and analyzed the effect for the reconstruct-ed image of the grid structure of the pure phase spatial light modulator(SLM)so as to fulfill the project of hologra-phy display just using phase only images. Then,we built the optical system so as to verify the correction of the theo-retical analysis. At the same time,we got the image of the first order whose intensity is higher than the others near the point of the zero order. Next,we loaded digital blazed grating into SLM to deal with the first order image. We re-alized the phenomenon that the image in the zero order has the highest intensity,which agrees well with the theoretical analysis. This project also offers a basis for the later three dimensional hologram display technology.%全息显示技术近年来得到飞速发展,为了进行纯位相图像的全息显示研究,根据菲涅耳衍射理论通过使用MAT-LAB软件编程得到相应相息图,阐述分析了纯位相空间光调制器(SLM)自身栅格结构对整个全息显示系统重构图像的影响,并搭建系统光路进行实验,结果表明在零级主极大附近得到能量较强的四个"一级再现像",后期通过加载数字闪耀光栅对多个一级再现像进行处理,在零级主极大处得到能量最高的再现像,实验验证与理论分析相一致,为进行三维图像全息显示技术的研究奠定了基础.
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