Theory of Three Represents of Legalism is Han Fei, Li Si and Shang Yang. Legalist school is a school that studies the way of state governance in the history of China, and put forward the idea of enriching Qiang Bing and governing the country according to law. It was an important school in hundred schools of thought that advocated the rule of law as the core idea during the Warring States Period.

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.