The first aspect is students' interest and physical and mental development level. When choosing educational content, we should consider students' physical and mental development level and their own interests, and choose content according to students' physical and mental development level, so as to teach and teach students well.

The second aspect is the need of social development. Now the country needs to vigorously cultivate innovative talents, so many schools will standardize the cultivation of talents according to the needs and needs of the country, and know where to cultivate them.

The third aspect is the educational goal. Educational goals are formulated according to the needs of social development and the laws of students' interests and physical and mental development level. It is the starting point and destination of educational activities. Similarly, the choice of teaching content also needs to be based on educational objectives.