Bilateral law is formulated on the basis of dialectical unity in teaching, in which teachers' teaching depends on students' learning, and students' learning cannot be separated from teachers' teaching.

The bilateral law is the law of the unity of teacher-led and student-centered.

Teachers are in the position of organizers in the teaching process and should give full play to their leading role; Students are in the position of learning subject in the teaching process, so they should give full play to their subjective initiative; Establish a cooperative, friendly, democratic and equal relationship between teachers and students.