"Centrally symmetric figure" is the content of the second section of chapter 23 of ninth grade mathematics (I) published by People's Education Press. This course is based on students' study of axisymmetric graphics, graphic translation and graphic rotation, and involves thinking methods such as induction and analogy, which is of great significance to stimulate students' exploration spirit and innovative consciousness. It is also an essential basis for further learning geometric knowledge such as circles. Through learning, students' understanding of "symmetrical graphics" is more perfect, which enriches their experience in mathematics activities, promotes their good view of mathematics, and plays a role in connecting the past with the future.