According to the official website "China Pedagogy", the hierarchy of courses means that courses are divided into different levels according to the logical structure of disciplines, and each level has its specific objectives, contents and functions. The curriculum level includes discipline level, grade level, school level and regional level, which has an important influence on students' learning. A reasonable curriculum level can help students build a solid academic foundation, develop various abilities and qualities, adapt to the local cultural and social environment, and thus better realize personal growth and social development.