It is thought to have been written by simply compiling the contents of existing law books like "Hosoruirin," meaning it only quoted the theories, Myobo Kanmon (questions and answers of interpretation of law) and Myobo Kanjo (law consideration) of famous Myobo experts in the Heian period such as SANUKI no Naganao, KOREMUNE no Naomoto, NAKAHARA no Akikane and ONO no Arichika.
『法曹類林』などの先行の法律書から内容をそのまま抜き出して集成した書とされ、讃岐永直・惟宗直本・中原明兼・小野有隣など平安時代の著名な明法家の学説・明法勘文・明法勘状などがそのまま引用されている。