Lyu Fu, styled Yuan Ying, later known as Cangzhouweng. Born in the late Yuan Dynasty and died in the Ming Dynasty, he was a native of Yin County (now Ningbo City). His ancestors moved from Hedong to Wu (now Jinhua City), and by his time, they had moved from Wu to Yin, where they settled. Lyu's family was poor in his youth, and due to his mother's illness, he took up the study of medicine. He met Zheng Lizhi in Sanqu (now Quzhou City) and became his disciple. Zheng taught him ancient prescriptions and books such as "Se Mai Yao Lun," which he studied diligently, recording medical cases and revising them. His medical skills improved, and he sought out and purchased ancient and modern medical books, studying them day and night, eventually mastering medical theory and beginning to practice medicine, achieving miraculous results. He extensively read medical classics and delved deeply into them, offering critiques on various medical texts and on past medical masters such as Bian Que, Canggong, and Hua Tuo. He authored works such as "Neijing Huowen," "Lingshujing Maijian," "Qiemai Shuyao," "Yunqi Tushuo," "Yangsheng Zayan," "Maixu," "Maixi Tu," "Nan Jing Fushuo," "Sishi Xieli Fang," "Changsha Cold-Damage Disease Shishi," and "Songfengzhai Zazhu."

Lyu Fu, was erudite and skilled in medicine, with unique insights. He treated strange and rare diseases with odd-ingredient formulas, curing them all. For example, there was a baby girl who was lethargic, with a red face but no fever. Doctors treated her for slow convulsions, but she did not recover for twenty days. Yuan Ying diagnosed her, finding her left guan pulse alone was slippery and rapid, while the rest were normal and harmonious. He said, "This girl is not ill." He concluded that the slippery guan pulse indicated accumulation, suspecting her mother drank alcohol and then breastfed the child, causing the girl to become drunk, not suffering from wind. Upon questioning, this was confirmed. He then treated her with Submature Bitter Orange and Pueraria Flower, two to three doses a day, and she recovered. His rich experience and knowledge were due to his extensive study of medical sources, and his contributions to the development of Chinese medicine were significant.