[Dashengbian (thesis on longevity) and its author].

Dashengbian was a very popular obstetric book in the 18th century. It once had a significant influence in history not only because it fairly well sumed up predecessors' experiences and filled in the gaps in the field of obstetrics, but also because it had an easy-reading, concise and practical contents. As for the author of the book, although many blockprinted editions were signed by Lay Buddhist Ji Zhai, his real name was unknown. This article holds that the book had been circulated for some time before it came out in the 54th year of Kang Xi reign which is in line with the manuscripts of Qian Long reign of the Qing dynasty and the names carried in its case records. According to other relevant data, the article believes that Lay Buddhist Ji Zhai was most likely to be Zhang Zhao, a scholar of the early Qing dynasty.