Refers to the style and period associated with the Qin dynasty, the first imperial Chinese dynasty, dating from 221-206 BCE. It was during this time that the Great Wall was constructed.——艺术与建筑索引典

Qin dynasty, also spelled Kin, Wade-Giles romanization Ch’in, dynasty that established the first great Chinese empire. The Qin—which lasted only from 221 to 207 bce but from which the name China is derived—established the approximate boundaries and basic administrative system that all subsequent Chinese dynasties were to follow for the next two millennia.——Britannica Academic  @en