First of all, education is a social phenomenon. Teachers represent a certain society to educate students, and students are people who make themselves the needs of society under the guidance of teachers. Second, students' physical and mental development level is not high, and their ability to understand and transform themselves and the environment is not strong. In order to improve their ability to understand and transform the world, they must be trained and transformed; Third, the purpose, plan and organizer of educational activities are all teachers, and students are only recipients of these purposes and plans and participants in activities. In this sense, students are the object of planning and design; Fourth, the development of students in all aspects is the purpose of educational activities. It is impossible for them to complete the task of cultivating themselves from the beginning, educate themselves from the beginning and exert educational influence on themselves. They must be educated by educators before they can educate themselves.