Abstract: Rectangular cavity is an essentially geometric structure of aircraft target, like inlet duct. As deep rectangular cavity is one of the most important scattering sources of concealed aircraft and the important identifying characteristics of this kind of target, it has significant meaning and practical applications in the research of scattering center modeling. In this paper, to design a high-precision scattering center model, a scattering center model of electrically large deep rectangular cavity was studied, utilizing ray tracing to determine the location of the multiple reflections of equivalent scattering centers, using the data of full-wave numerical method to accurately estimate the amplitude parameters of the scattering centers. In this model, there set some physical properties and a direct relationship between its parameters and the geometric parameters of cavity for the actual usage of model easily. The validated results indicate that scattering center model can precisely simulate the wave of the radar cross section and the high resolution range profiles of the electrically large deep rectangular cavity targets.