In view of the problems of unreasonable production process and slow speed of drawing for interior design, this paper puts forward a solution to optimize the production process of drawing, including importing CAD drawings, changing the order of materials and lighting settings, testing the materials and lighting, speeding up the drawing speed using photon map, transferring the TGA format into TIF file, and generating material channel drawings with the conversion plugins. The solution effectively improves the speed and quality interior design drawings, makes students master more practical production methods, and improves the teaching effect.