Cheng Zhi was a Qing-dynasty physician whose public biographical record is limited; the surviving evidence centers on his medical writings. His Yi Jing Li Jie (An Understanding of the Medical Classics) aims to expound the medical principles of the Inner Canon (Neijing), and belongs to the tradition of medical-classics scholarship that combines annotation with interpretation, reflecting the Qing scholarly preference for grounding medicine in the classics and explaining one classic through another. His other work, Shanghan Jing Zhu (Annotated Classic of Cold Damage), likewise follows the path of classical commentary, explicating the text and meaning of the Treatise on Cold Damage (Shanghan Lun). His scholarly range thus covers the two major classical systems, the Inner Canon and the Cold Damage tradition. Topically, Cheng Zhi focused on interpreting medical-classical texts and connecting their principles; his style tends toward the commentary form, emphasizing exposition and development rather than formulas or clinical case records. Because the historical sources are scattered, his life, teachers, and circle of associates cannot be examined in detail, and scholarly attention to him depends largely on these two commentaries. Overall, Cheng Zhi may be regarded as a Qing physician known for classical annotation, whose works offer some reference value for later readers of the Inner Canon and the Treatise on Cold Damage.
