Teachers must prepare lessons in advance if they want to have a good class. The so-called lesson preparation, first of all, we must study textbooks, understand the knowledge of textbooks, and integrate into our own knowledge; Secondly, we should study the syllabus, teaching materials and students, make clear the teaching purpose, focus and requirements, and make it become the guiding ideology of teachers' teaching; Thirdly, it is necessary to further study the internal relationship between the requirements of teaching purpose, teaching content and students' reality, and try every means to adapt the teaching content to students' acceptance ability, promote students' intellectual development and realize educational purposes. To realize the above three changes, teachers must have the ability to learn and organize teaching materials. The stronger this ability, the better the lesson preparation effect, which is very beneficial to improve the quality of classroom teaching.

(B) to understand and study students' ability

Understanding and studying students deeply is the starting point of teachers' education and teaching, and it is also a basic skill of teachers. Teachers should be good at understanding students' personality and psychological state according to their external performance, such as ideological status, moral level, knowledge base, intelligence level, hobbies, personality and so on. Only by understanding students' reality can we be targeted, be good at recovering losses and teach students in accordance with their aptitude.