Guiding education and teaching is the principal's main daily work. The principal's leadership in education and teaching is mainly the leadership in teaching ideas, teaching methods and teaching quality. Principals should keep abreast of the ideological trends of the whole school's education and teaching, grasp key issues by using contradiction analysis, solve problems according to educational laws, and always grasp and maintain the correct educational direction. Principals should participate in the research on the process and quality of education and teaching activities, organize, guide and motivate teachers to find problems in research, solve problems in discussion, refine experience in summary and rise to theory. In order to master the initiative in guiding education and teaching, principals should master the syllabus and teaching materials of various courses, the teaching contents and methods of several courses, and the modern information education technology. Suhomlinski once pointed out that "without the knowledge of all subjects listed in the teaching plan, it is impossible to lead the teaching and education process of the school". Proficient in business is an urgent and arduous task before the principal.