Sun Ziyun, whose nationality and dates of birth and death are now difficult to determine, has only limited publicly available information. So far, only one work by this author is held in the collection, namely Ciji Yihua (Medical Talks from Ciji). Classified under medicine and health, the book belongs to the genre of traditional Chinese medical talks (yihua), recording clinical observations, discussions of medical principles, and notes on the use of medicines in the form of essays and jottings. Its style is generally plain and concise, with an emphasis on practical use, making it easy for readers to grasp diagnostic and therapeutic ideas as well as everyday health knowledge within relatively short pieces. Because biographical material on the author is scarce, scholars and readers still lack a complete picture of the person and his medical thought, and current understanding rests mainly on this single surviving work. The book has therefore become the primary basis for examining Sun Ziyun's medical views and manner of expression, and it offers some reference value for the study of modern Chinese medical talks and the spread of folk medical knowledge.
