Prince Nakanooe defeated the Soga family changed the government system from family-oriented to the Imperial-family-oriented. In this period, Tang China had a territorial ambition to invade Kokuryo Korea. In the meantime, Kudara Korea was on the decline and Silla Korea was on the way to unify the Koran Peninsula. In order to deal with the gravity of the situation change, the new dress regulation was adopted.
The dress regulations of the Suiko Dynasty let the head of family take the practical position in the national politicfal scene just like the officers ranked under state councilor with senior grade of the fourth court rank in later ages. After the fall of Soga family, the new regulation was adopted in the third year of Taika Dynasty [647 A.D.], established the senior and junior rank of shokukan, shukan and shikan.