Liu Taiyi came from Liu Hongzhang's "Taiyi Health Collection", which became Liu Taiyi's health talk after revision. This series of books has also published "Disease is one's own life" and "It is a three-point poison of medicine". Liu Taiyi's Talk about Health Preservation is actually about how to treat diseases. This paper tells the story of Chun Liu, the ancestor of Liu Hongzhang, a physician in the Ming Dynasty, who tried to become a doctor in prison in accordance with the wishes of Xu Yihua, the Yongle Queen who died of breast cancer. The real doctor Liu was from the Ming Dynasty. As Liu Hongzhang claimed to be a descendant of Chun Liu and the author of this book, the word "Liu Taiyi" now refers to Mr. Liu Hongzhang. At the end of 2008, Liu Hongzhang was arrested for manufacturing and selling counterfeit drugs.