Politics, metallurgy and historical time are not separated; In organic chemistry, bands and microorganisms are not separated; This is mainly because the common sense of high school students and the technical expertise of college professional knowledge are determined by the docking problem. The key to the classification of political disciplines is: basic theory of Marxism-Leninism, social economics, history department, public management, sociology, social psychology, business administration, law major, philosophy and so on. The major classification of geography teaching focuses on astronomy, urban planning and construction, water conservancy and hydropower engineering, geological exploration, geography education, resources and environment, etc.