Han Fei inherited and summarized the thoughts and practices of Legalism during the Warring States Period, and put forward the theory of centralized monarchy. He advocated that "things in the four directions must be in the center; the saints insist on what is important, and the four directions will respond" ("Han Feizi·Property Rights"), the power of the country must be concentrated in the hands of the monarch ("sage"), and the monarch must have the right to have Only with power can the world be governed. "The lord of thousands of chariots is the king of thousands of chariots. Therefore, those who control the world and conquer the princes use their power and power" ("Han Feizi: Renzhu"). To this end, the monarch should use various means to eliminate the hereditary slave-owning nobles, "disperse their parties" and "seize their assistants" ("Han Feizi·Zhudao"); at the same time, select a group of feudal officials who have been trained in practice to replace them, "The prime minister must be from the state department, and the fierce general must be from the army" ("Han Feizi Xian Xue"). Han Fei also advocated reform and the implementation of the rule of law, calling for "abolition of the teachings of the previous kings" ("Han Feizi·Wen Tian") and "taking the law as teaching" ("Han Feizi·Wuzhe"). He emphasized that when "laws" are formulated, they must be strictly implemented, and no one should be exempted from them, so that "the law is not noble", "the ministers will not be spared from punishment, and the good will be rewarded" ("Han Feizi·Youdu"). He also believed that only by implementing severe punishments could the people obey, society be stable, and feudal rule be consolidated. These ideas of Han Fei reflected the interests and demands of the emerging feudal landlord class, and provided a theoretical basis for ending the feudal separatism and establishing a unified centralized feudal state. Many of the political measures taken by Qin Shi Huang after he unified China were the application and development of Han Fei's theory.