Theoretical categories are the condensation of social and historical phenomena by human thinking and the generalization of objective reality. The general concept of a discipline, that is, the basic theoretical category that constructs the theoretical system of the discipline. Condensing the consensus of theoretical categories is the foundation and premise of building an academic community. There are four main ways to derive theories by using theoretical categories to explain and express theoretical claims: first, theoretical categories deduce vague perceptions into clear understandings; second, theoretical categories deduce long-term ideas into realistic plans; third, theoretical categories systematize and organize practical experience; and fourth, theoretical categories concretize abstract theoretical reality.