In modern Western philosophy,both Hegel's concept of"civil society"and Feuerbach's concept of"class"are abstract soci-eties with formal universality,both of which are ontological provisions of category theory.That is to say,social issues are all discussed under the principles of rational metaphysics.The existential realm opened by Marx after the philosophical revolution liberated social concepts from the provisions of modern category theory,achieving the organic unity of sensibility and historicity of social concepts.