Optical content is the focus and difficulty of the first volume of the eighth grade of PEP physics. Especially the imaging law of convex lens and its application.The experiment is very exploratory. At present, the standard equipment equipped in the laboratory can only study some optical phenomena, and the integration is poor. Also large size, inconvenient to carry and use.Unable to satisfy students' independent inquiry after class.Based on this, the author tried to self-made optical "five in one" innovative teaching aids.Using cardboard, we can explore two classic optical experiments and three applications, and realize multi-functional independent exploration.The experimental effect is obvious, and the data is real-time and accurate.The material is environmentally friendly and cheap, suitable for self-made promotion.