Shen Buhai in the context of "Imperial examination"

Fajia (Chinese: 法家; pinyin: fǎjiā), or the School of fa (incl. law, method), often translated Legalism, was a bibliographic school of primarily Warring States period classical Chinese philosophy, including more administrative works traditionally said to be rooted in Huang-Lao Daoism. Addressing practical governance challenges of the unstable feudal system, their ideas 'contributed greatly to the formation of the Chinese empire' and bureaucracy, advocating concepts including rule by law, sophisticated administrative technique, and ideas of state and sovereign power. They are often interpreted along realist lines. Though persisting, the Qin to Tang were more characterized by the 'centralizing tendencies' of their traditions.

The school incorporates the more legalistic ideas of Li Kui and Shang Yang, and more administrative Shen Buhai and Shen Dao, with Shen Buhai, Shen Dao, and Han Fei traditionally said by Sima Qian to be rooted in Huang-Lao (Daoism). Shen Dao may have been a significant early influence for Daoism and administration. These earlier currents were synthesized in the Han Feizi, including some of the earliest commentaries on the Daoist text Daodejing. The later Han dynasty considered Guan Zhong to be a forefather of the school, with the Guanzi added later. Later dynasties regarded Xun Kuang as a teacher of Han Fei and Qin Chancellor Li Si, as attested by Sima Qian, approvingly included during the 1970s along with figures like Zhang Binglin.

The Han Feizi (simplified Chinese: 韩非子; traditional Chinese: 韓非子; pinyin: Hánfēizi; lit. 'Book of Master Han Fei') is an ancient Chinese text attributed to the Legalist political philosopher Han Fei. It comprises a selection of essays in the Legalist tradition, elucidating theories of state power, and synthesizing the methodologies of his predecessors. Its 55 chapters, most of which date to the Warring States period mid-3rd century BCE, are the only such text to survive fully intact. The Han Feizi is believed to contain the first commentaries on the Dao De Jing. Traditionally associated with the Qin dynasty, succeeding emperors and reformers were still influenced by Shen Buhai and the Han Feizi, with Shang Yang's current again coming to prominence in the time of Emperor Wu.

Often considered the "culminating" or "greatest" Legalist texts, Han Fei was dubbed by A. C. Graham amongst as the "great synthesizer" of 'Legalism'". Sun Tzu's The Art of War incorporates both a Daoist philosophy of inaction and impartiality, and a 'Legalist' system of punishment and rewards, recalling Han Fei's use of the concepts of power and technique.

Li Si ([lì sɹ̩́]; c. 280 – 208 BC) was a Chinese calligrapher, philosopher, and official of the Qin dynasty. He served as Qin state Chancellor from 246 to 208 BC, first under King Zheng — who later became Qin Shi Huang, the "First Emperor" of the Qin dynasty. He then served under Qin Er Shi, Qin Shi Huang's eighteenth son and second emperor. In the Shiji, Li Si is said to have admired and utilized the administrative ideas of Shen Buhai, repeatedly referring to the technique of Shen Buhai and Han Fei, but regarding law, followed Shang Yang.

John Knoblock, a translator of classical Chinese texts, considered Li Si to be "one of the two or three most important figures in Chinese history" for his efforts in standardizing the Qin state and its conquered territories. Li Si assisted the Emperor in unifying laws, governmental ordinances, and weights and measures, standardizing chariots, carts, and characters used in writing, facilitating the cultural unification of China. He "created a government based solely on merit, so that in the empire sons and younger brothers in the imperial clan were not ennobled, but meritorious ministers were", and "pacified the frontier regions by subduing the barbarians to the north and south". He had the metal weapons of the feudal states melted and cast into bells and statues. He also lowered taxes and eased draconian punishments for criminals that had originated from statesman Shang Yang.

Han was an ancient Chinese state during the Warring States period. Scholars frequently render the name as Hann to clearly distinguish it from China's later Han dynasty. It was located in central China (modern-day Shanxi and Henan) in a region south and east of Luoyang, the capital of the Eastern Zhou. It was ruled by aristocrats of the Ji (姬) family ancestral temple who rose to power as a ministerial family in the state of Jin, and whose power eventually eclipsed that of the Jin ruling house. The partition of Jin which resulted in the states of Han, Wei, and Zhao, marked the beginning of the Warring States period.

The state of Han was small and located in a mountainous and unprofitable region. Its territory directly blocked the passage of the state of Qin into the North China Plain.. Although Han had attempted to reform its governance (notably under Chancellor Shen Buhai who improved state administration and strengthened its military ability) these reforms were not enough to defend itself and it was the first of the seven warring states to be conquered by Qin in 230 BC.

Herrlee Glessner Creel (January 19, 1905 – June 1, 1994) was an American Sinologist and philosopher who specialized in Chinese philosophy and history, and a professor of Chinese at the University of Chicago for nearly 40 years. A prolific author, on his retirement Creel was praised by his colleagues as an innovative pioneer on early Chinese civilization, and as one who could write for specialists and general public with cogency, lucidity, and grace. Creel was known for his early work on Confucius, the history of Chinese thought, and his unsurpassed study and translation of Shen Buhai.