Digital twinning technology unifies the design and management of multi disciplinary and multi physical field systems through multi dimensional heterogeneous time series data,which allows the construction of high fidelity digital mirror model.Based on this technology,this paper puts forward ideas and methods for constructing a digital model of a typical photoelectric system.Meanwhile,combining with the analysis of the intrinsic physical characteristics of scene elements,the key technologies of digital twin simulation of high realistic infrared scenes are described.The organic combination of digital model and scene simulation can accurately achieve real time interaction and iterative operation and optimization of photoelectric systems,and shorten the product development cycle with high efficiency and high quality.