The criteria of a good class in teaching theory are clear purpose, correct content, proper method, good organization, high enthusiasm and good teaching effect. Of course, a good class is evaluated from many aspects and angles. Not only the mastery of classroom knowledge, but also the development of students in non-cognitive factors, such as motivation, attitude, emotion and intelligence. In teaching, teachers should fully understand the specific situation of students, and be able to use teaching methods and means suitable for students' characteristics, so that students can actively participate in teaching activities and achieve the most optimized and comprehensive teaching effect.