Shitokan-sei system was introduced into Japan around the end of seventh century to the beginning of eighth century when the Ritsuryo system, which was based on the Ritsuryo of Tang, was established.
日本では、7世紀後半-8世紀初頭の時期に唐律令をもとにして律令制が始まると、四等官制も一緒に導入された。