Basic social contradictions, including the contradiction between productive forces and production relations, the contradiction between economic base and superstructure. Historical materialism holds that basic social contradictions are the fundamental driving force to promote the development of human society, and the history of human society is, in the final analysis, the history of basic social contradictions. The movement of basic social contradictions is regular. First, the relations of production must conform to the law of productive forces; Secondly, the superstructure must meet the requirements of economic base development.