As one of the research directions of computational photography,light field imaging can be used to obtain four dimensional plenoptic information of a target in a single shot,including spatial two dimensional and angular two dimensional information,which can realize three dimensional imaging through the principle of multi view stereo matching.At present,light field imaging is concentrated in the field of visible light,and applications in other wavelength bands are less common.In this paper,an infrared light field imaging system based on Zemax simulation combining the light field imaging system with the long wave infrared imaging system is proposed.Starting from the principle of light field imaging and the characteristics of infrared imaging,the structural design of the long wave infrared light field imaging system is studied in depth.At the same time,in order to enhance the effect of three dimensional imaging,the influence of optical parameters on depth resolution of the infrared light field imaging system is analyzed,and the depth resolution is mainly determined by microlens imaging relationship,the microlens working F number,the focal length of the main lens,the object distance and the detector pixel size.A focused light field imaging system is chosen for few pixels in the LWIR detector.According to the design result,Zemax simulation is used to verify the feasibility of the combination of two systems and the validity of the theoretical design.