The "five realities" are real, solid, abundant, flat and true. In the experimental study of "new basic education", Ye Lan put forward "five facts" about "what kind of class is a good class";

(1) A meaningful class is a solid class. For students, at least learn something, and then further exercise their abilities, and then develop into a good and positive emotional experience, thus generating a strong demand for further study. A meaningful class is a solid class, not a lively class.

(2) An efficient classroom is a full classroom. On the one hand, it is relatively efficient for many students in the class, on the other hand, it is not a good class without efficiency. An efficient class, that is, a substantial class, is a class with content.

(3) The productive class is a fruitful class. In other words, a class is not entirely the result of presupposition, but the exchange of true feelings and wisdom between teachers and students in the class. This process has both resource generation and process state generation. This kind of class can be called rich class, which is rich in content and active in many aspects, giving people inspiration.

(4) Normal class is plain class. The value of the classroom lies in producing many new things through the collision and discussion between teachers and students. Such a class is called a prime class. It is necessary to downplay open classes and attend more seminars. No matter who is listening to the class, the teacher should be indifferent and only have students in mind.

(5) The class to be perfected is the real class. Can't be perfect. It should be a real, unadorned, reflective and reconfigurable course. If it is true, it is flawed. Shortcomings are only real indicators. This class can be called a real class.

In the process of teaching, teachers should also increase their investment, and don't make gestures, so as to get tangible benefits.

Under the guidance of the new educational concept, a good teacher should treat every progress of students with satisfaction, stimulate students' interest in learning with pleasure and satisfaction, treat students' mistakes with tolerance and satisfaction, stimulate students' creative learning with excitement and satisfaction, and let students learn independently in self-esteem, self-confidence and self-improvement.