There are also different versions of Xi 'an Grade 7 textbooks, such as China People's Education Edition, Mathematics Beijing Normal University Edition, English People's Education Edition, History Beijing Normal University Edition, and Moral and Legal Education Edition. The setting of teaching materials is helpful to the learning and growth of junior middle school students. Based on time series, the concepts of time and space are established, and the combination of points and lines presents a historical face. Illustrated with pictures and texts, cultivate the subject's emotion and establish the concepts of time and space and time and space based on time sequence.