"Fang Tu" is a book for both medicine and food. "Fang Tu" is a family therapy based on medicine, which is both practical and safe. It shows that medicine is a common food in the family, and there is no taboo, that is, medicine and food are homologous. Yi Tu's Prescription contains hundreds of diseases in clinical departments such as internal medicine, surgery, gynecology, pediatrics and tumor. Each prescription lists the prescription, efficacy, usage and instructions, which are clear and clear, easy to use, reliable in curative effect, simple in operation, practical and safe, and provide a family treatment scheme based on drugs. The homology of medicine and food means that many foods are medicines, and there is no absolute dividing line between them. Ancient doctors applied the theory of "four natures" and "five flavors" of traditional Chinese medicine to food, and thought that every food also had "four natures" and "five flavors".