All entries are classified into 18 categories (Ruiju): gods of heaven and earth, the emperor, consort of the emperor, human affairs, events in the year, music, prize and party, dedication, political affairs, criminal law, organization of government, literature, rice fields, good omen, natural calamity, the teachings of Buddha, manners and customs, and strange customs.
神祇、帝王、後宮、人事、歳時、音楽、賞宴、奉献、政理、刑法、官制、文学、田地、祥瑞、災異、仏道、風俗、殊俗という18の分類（類聚）ごとにまとめられておいる。