The Book of Rites - Monthly Ordinances contains terms such as "examining injuries," "inspecting fractures," and "determining causes of death," which are simple records of ancient court examinations of injury and death cases. The Collection of Doubtful Cases (951 AD), written by He Ning and his son during the Five Dynasties period, is the earliest extant forensic work. In the Song Dynasty, there were works such as Nei Shu Lu (author unknown), Zhe Yu Gui Jian (written by Zheng Ke in 1200 AD), and Tang Yin Bi Shi (written by Wan Rong in 1213 AD). During the Southern Song Dynasty, the use of Inspection Forms and Front and Back Human Body Diagrams for Inspection enriched the content of forensic medicine. Later, Song Ci compiled the essence of works such as Collection of Doubtful Cases and Nei Shu Lu, combined with new experiences in forensic medicine at the time, to create Xiyuan Lu{|119|} (1247 AD). This book includes human anatomy, corpse examination, scene investigation, identification of causes of mechanical injuries and deaths, various poisons of the time, and methods for emergency toxin removal. This book is a renowned ancient forensic work and has had a significant influence abroad.