Abstract: According to the natural phenomenon that produces a shadow of objects under direct sunlight, the formation principle of stick sunlight shadow chart was studied. Analyzing shadow variation with time, the mathematical model of time, solar position and shadow track was built. The equation of building towards, space, and lighting time were derived using shadow track chart. The computer experiment platform of reverse was developed by programming Visual Basic and Visual Lisp realizing reverse algorithm. Finally, a reverse method of the effect of building lighting based on stick sunlight shadow chart is constructed.