As well as Oni no sei (the automatic promotion of the persons at the age of 21, whose parents were from Imperial Prince to the fifth rank, or whose grandparents were upper than third rank), uji no shaku was a privilege for powerful clans, and Jimoku (ceremony for appointing officials) was held in accordance with a recommendation of uji no choja (the head of the clan).
氏爵は蔭位の制同様、有力氏族への特典であり、氏長者の推挙により、除目が行われた。