Much of the original content is known due to fragments of the code that are included in the "Ruiju sandai kaku" (Assorted regulations from the three generations) and the "Seiji Yoryaku" (Brief outline of the government).
また、『類聚三代格』及び『政事要略』に収められた逸文などによってその内容の多くを知ることが出来る。