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Shang Yang, original name (Pinyin) Gongsun Yang or (Wade-Giles romanization) Kung-sun Yang, (born c. 390, Wei state, China—died 338 bce, China), Chinese statesman and thinker whose successful reorganization of the state of Qin paved the way for the eventual unification of the Chinese empire by the Qin dynasty (221–207 bce). Shang Yang believed that the integrity of a state could be maintained only with power and that power consisted of a large army and full granaries.
Entering into the service of Duke Xiao, head of the state of Qin, Shang Yang replaced the feudal division of the country with a system of centrally appointed governors. He instituted compulsory military service and a new system of land division and taxation and insisted on strict and uniform administration of the law. He unified the measures for length, capacity, and weight. He is also said to have forced all persons into “productive occupations,” such as farming or soldiering (but not commerce), and to have set up a system of mutual spying among the people. His reforms violated the interests of Duke Xiao and other nobles. When Duke Xiao died and Shang Yang fell into disgrace in 338 bce, he was tied to chariots and torn apart.
The work Shangjun shu (“Book of the Lord of Shang”) probably contains writings and ideas of Shang Yang, although the exact authorship of the book is in doubt. It is one of the major works of the highly pragmatic and authoritarian Legalist school of Chinese philosophy.
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