Abstract The process of reflex formation is a neural regulatory activity based on the structure of reflex arcs. The construction of concepts such as the structure of reflection arcs and the process of reflection formation is relatively micro and abstract, which is a key and difficult point in teaching. Through the design, production, and teaching practice of the self-made teaching tool "Reflection Formation Process Demonstrator", cleverly utilizing the LED tracing effect and the internal energy of compressed gas, effectively and dynamically demonstrating the generation and transmission process of impulses, as well as highlighting the effects of impulses - elbow bending and elbow extension reflexes, breaking through the teaching difficulties of adapting human structure and function. At the same time, the self-made teaching aids can be used in the teaching of review courses to achieve the integration of related knowledge points and construct a large unit knowledge system.