Abstract: With the popularization of the new college entrance examination system, high school students in China no longer have to study subjects compulsory in accordance with the original choice of liberal arts and sciences. The teaching organization form that matches the course selection system has been promoted and used in many schools. However, the implementation of the class system has reduced the student's learning burden to a certain extent, and has established a good development platform for the all-round development of students. However, many high school teachers have mixed feelings.

Key words: Hierarchical teaching, Class system, High school teachers