Legalist school is one of the most important people in pre-Qin philosophers. And put forward a set of theories and methods. This provided an effective theoretical basis for the later establishment of the centralized Qin Dynasty. The later Han Dynasty inherited the centralization of authority and legal system of the Qin Dynasty and was the political and legal subject of the ancient feudal society in China. Legalists, as a major faction, put forward the idea of governing the country according to law, which still has far-reaching influence, which shows that they attach great importance to the legal system and regard the law as a compulsory tool conducive to social governance. These thoughts, which embody the construction of the legal system, have been used to this day and become the main ruling means for centralized people to stabilize social unrest.