Cao Ying-fu (1866-1937), named Jiada, was from Jiangyin County, Jiangsu Province. In the 21st year of the Guangxu reign of the Qing Dynasty (1895), he was recommended as a filial and incorrupt official. He was well-versed in literature and also knowledgeable in medicine, later advancing his studies at the Nanjing Academy. At that time, the headmaster Huang Yizhou (Yuantong) was a master of classical studies in the late Qing Dynasty. Besides his studies in classics, he applied textual criticism and exegesis to medical classics, achieving profound insights in the research of cold-damage disease theory. Cao inherited this tradition and excelled in the study of cold-damage disease, often using Zhang Zhongjing's prescriptions to treat patients with great efficacy. Ding Gan-ren founded the Shanghai Chinese Medicine Specialized School and invited Cao to serve as the dean of academics. He personally conducted lectures on cold-damage disease and the "Jingui," leveraging his profound knowledge of Han studies to provide clear and thorough explanations of the profound and intricate original intentions of Zhang Zhongjing, earning the admiration of his students. His works include Subtleties of Cold-Damage Disease, Subtleties of the Jingui, and the medical casebook Records of Jingfang Experiments, compiled by his esteemed disciple Jiang Zuojing.