While Sadanobu was hastening a reformation of the shogunate system through the Kansei Reform, he also set out the 'Kansei Igaku no kin' (the ban of Kansei's illegitimate learning) and 'Shoshiodan no kin' (the ban of non-officer crossing) to protect the Shushi-gaku which was the root of the ideology.
定信は寛政の改革によって幕藩体制の再建を進めていく中で、その思想的根幹である朱子学を保護して「寛政異学の禁」や「処士横断の禁」を打ち出していた。