Focusing on simulation of Spatial Heterodyne Spectroscopy(SHS),the emulational calculation of different characteristic light source is described.Based on the basic concept,configuration of system and the relationship between systemic parameter and interference,the conceptive simulations of monochromatic source and continuum spectrum source are discussed separately.The impact of different bandwidth and sampling bandwidth on the emulational results is also analyzed.Moreover,Contrast and analyze the experimental data obtained by Brassboard SHS and simulating result.These experimental results demonstrate that emulational data is coincident with experimental data,which offers us beneficial guide and necessary basis for designing and rebuilding SHS system.