Han Fei was an influential scholar and political philosopher master during Warring States Period. There are many discussions on the origin of his thought. There are also discussions on Han Fei's inheritance. Generally speaking, Han Fei was instructed by Xunzi, and then he synthesized the concepts of the Legalist School-laws, power and tactics. Meanwhile, it is well-believed that his thought was affected by the Mohist School and the Taoist School, bringing his predecessors' ideas together into a coherent ideology. It is commonly accepted that Confucianism, Taoism, Mohism and Logicianism were integrated into the thought of Han Fei. Therefore, some claim that the thought of Han Fei was evolved directly from Confucianism while others argue it was evolved from the decadent Taoism. However, what is true regarding Han Fei should be that his thought was concluded and integrated with other schools of philosophy on the premise of pursuing the innovation of "rule of law." It has developed its own school of philosophy. From the aspect of rule of law, emulation, and commentary on Mohism, the author examines how thought of Han Fei was evolved and transformed from the Mohist School in this article.