Abstract: Category is the logical expression of philosophical thought. Based on the vision of ideological and academic system, it is necessary to present the true spirit and conduct academic research on XI Jinping's thought on the rule of law by abstracting and refining the core category of XI Jinping's thought on the rule of law with Marxist materialist dialectics. As general principles of Marxism and the combination of the rule of law with Chinese characteristics, XI Jinping's thought on the rule of law is the latest achievements of sinicization of Marxism theory of the rule of law, in which the innovative discourses such as the relevant theory and practice, the politics and the rule of law, democracy and the rule of law, power and rights, the rule of law and the rule of virtue, profoundly reveal the essential characteristics of the rule of law of socialism with Chinese characteristics and the law of development, and fully embody the spirit of Marxist materialist dialectics. The above discourses constitute the core category of XI Jinping's thought on the rule of law, and have guiding significance of the world outlook and methodology in the construction of the rule of law in China in the new era.