It is very important to guide students to learn by themselves in class, which is a very important aspect of students' autonomous acquisition. Then the teacher setting is very important. On the one hand, we should fully prepare lessons, prepare lessons according to the specific conditions of the classes we teach, and prepare teaching materials according to the students' recent development fields. On the other hand, setting questions should be targeted, hierarchical and gradient. Let students have a certain sense of learning gain and satisfaction, thus encouraging students to enter the next learning link and constantly acquire new knowledge.