本文利用激光的时间相干性对光程差的准周期性特点,采用光程差为腔长的偶数倍的物光照明以获得大景深全息图的拍摄,用普通的一米腔长的He-Ne激光器成功地拍摄了面积5m~2,景深8.2m的全息图,为全息技术在使用普通市售激光器情况下应用于工程技术拍摄大型结构开辟了很好的远景。 In this paper, the temporal coherence of the laser is used to obtain the image of a large depth of field hologram with an even-fold optical path length difference of the cavity length. With a normal one-meter-long He- The Ne laser successfully captures a hologram with an area of ​​5 m 2 and a depth of field of 8.2 m, opening up a good prospect for holographic technology to be used in large-scale engineering and engineering photography using commercially available lasers.