First-class in the country and first-class in the region. In China, the construction of first-class universities refers to the first-class universities in the construction of "double first-class", that is, national first-class universities and regional first-class universities, that is, domestic first-class universities, that is, first-class universities at the national level and in ethnic areas. The construction goal of "double first-class" is hierarchical, including world first-class, national first-class and regional first-class, and "double first-class" includes "first-class university" and "first-class discipline".