The old textbook focuses on the systematic exposition of the principles and laws of things, and then uses it to answer some questions. The new textbook focuses on some phenomena or examples, and tries to avoid direct narration of essence and law. Instead, we design some activities, hoping that students can discover the truth and laws of things through these phenomena and examples. To sum up, the old textbook is from essence to phenomenon, and the new textbook is from phenomenon to essence. It should be said that the new textbook is more difficult to teach than the old one.