Compared with traditional infrared imaging, infrared phase imaging has the following characteristics: firstly, infrared phase imaging can obtain more spatial information of the target and synthesize stereoscopic images, especially for biological samples, phase imaging can obtain more abundant sample information; secondly, The camouflage in military targets can be identified by infrared phase imaging, because it is relatively easy to camouflage a certain surface feature of the target, but it is very difficult to camouflage the body shape characteristics of the target; in addition, the application of infrared phase imaging to the linewidth measurement of integrated circuit chips can reduce the results. Sensitivity to substrate thickness. The disadvantage of infrared phase imaging is that the current algorithm model of infrared radiation phase information and the distance algorithm model between the target and the detector is not perfect, the algorithm and the calculation of reconstructing 3D images are large; the related devices of infrared phase imaging still need to be developed.