The rare books at the National Taiwan University had been collected during the Taihoku Imperial University Period (1928-1945). Among these books, the one related to Ritsuryou are put together in Momoki Bunko and Nagasawa Bunko. The author has published an article in the Japanese Journal “Bulletin of the Society for Legal History No.15” to discuss Momoki Bunko and Nagasawa Bunko, in which the author divides the rare books into two categories—Rikkokushi and Ritsuryou—and focused on the Ritsuryou in Momoki Bunko. Based on the preliminary study on the historical records on the Rituryou in the Nagasawa Bunko series, this article discusses the book “Ishitsuryou Hikou” in Nagasawa Bunko as well as the edition issues.