Han Feizi, was a Chinese philosopher who, along with Li Si, Gongsun Yang, Shen Dao and Shen Buhai, developed the doctrine of Legalism. Unlike the other famed philosophers of the time, Han Fei was a member of the ruling aristocracy, having been born into the ruling family of the state of Han during the end phase of the Warring States period.
Han Fei belonged to the school of Ancient Chinese Philosophy called Legalism. Legalism assumed that people were naturally evil and always acted to avoid punishment while simultaneously trying to achieve gains; thus, the law must severely punish any unwanted action, while at the same time reward those who follow it. Han Fei Synthesized the ideas of Shang Yang, Shen Buhai, and Shen Dao, while borrowing Shang Yang's emphasis on laws, Shen Buhai's emphasis on techniques, and Shen Dao's ideas on authority and prophecy. Han Fei's interpretation of Legalism stressed that the autocrat will be able to achieve the ultimate ends of Legalist philosophy of firm control over the state with the mastering of three concepts: his position of power (势); certain techniques (术), and laws (法) as described in his classic work, the Han Feizi (book).
He saw the Tao as a natural law that everyone and everything was forced to follow. Han Fei Zi also believed that an ideal ruler made laws, like an inevitable force of nature, that the people could not resist.
His philosophy was very influential on, and became one of the guiding principles of, King Zheng of Qin, who became the first emperor of China, Qin Shi Huang. After the early demise of the Qin Dynasty, Han Fei's philosophy was officially vilified by the following Han Dynasty. Despite its outcast status throughout the history of imperial China, Han Fei's political theory continued to heavily influence every dynasty afterwards, and the Confucian ideal of a rule without laws was never again realized.