In view of the shortcomings of "Model of Respiratory Movement" in the textbook, simple equipment can be used to make experimental equipment. Water pipe and aluminum wire are used to replace the small square wooden strip and flat iron sheet in Model 1 in the textbook, and mineral water bottle is used to replace the glass bell jar in Model 2 in the textbook. After the experimental improvement, the experimental phenomenon is more intuitive, obvious and easy to observe. Experimental equipment is simple, easy to make, easy to operate, can let students experiment; It can not only realize the teaching purpose, cultivate students' practical ability, but also increase the fun of classroom teaching.