Abstract:In this paper,ergonomics is taken as the guide to design and study the single soldier photoelectric handheld devices,which aiming to improve the man-machine performance of such devices and strengthen the application of ergonomics in the design.Through the man-machine data relation,man-machine interface design,shape design,color and material analysis,the specific and effective design principles are put forward; the handheld thermal imager is designed and optimized.The application of ergonomics can effectively optimize the man-machine relationship,make the equipment safe and comfortable,easy to operate,so as to improve the user experience.