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The original title of this book Sanyin Jiyi Bingyuan Luncui, abbreviated as Sanyin Fang, was written by Chen Yan in the Song Dynasty in the first year of Chunxi (1174).

The main existing versions of this book include: Southern Song Dynasty engraved version with Bu Yuan Masha, Yuan engraved version, Nikkanbun 2nd year edition, Nikko Roku 6th year (1693) Echigo edition, Sikuquanshu The original version was published by Qinglianhua Pavilion in the 23rd year of Guangxu's reign in the Qing Dynasty, the lithographed version was published by Shanghai Hongzhang Book Company in 1934, and the printed version was published by People's Medical Publishing House in 1957.

Sanyin Fang The book has 18 volumes and 180 chapters. The content covers various subjects including internal medicine, external medicine, gynecology, pediatrics, and five sense organs, and contains more than 1,050 poems. Although this book mainly contains prescriptions and belongs to the category of prescription books, basic theory content also accounts for a large proportion. The important features of the compilation style of this book are to classify syndromes according to causes, to list prescriptions according to syndromes, to discuss first and later, and to combine prescriptions and theories. The book not only has "narratives" under the disease syndromes to discuss the causes and pathogenesis, but also has many special medical treatises that explain physiology, pathology, etiology, diagnosis, luck, etc. It is quite inspiring to read.

Chen Yan emphasized that "when treating a disease, we must first identify the cause" and pointed out that "there are three causes: internal, external, and no internal and external. Internally there are seven emotions, and externally there are six sexual desires. Neither internal nor external, it is the back. "Often." Chen believes that the three causes can cause disease alone or together. In the process of the three causes of disease, new pathogenic factors such as blood stasis and phlegm-fluid retention can also occur; in this case, Under the guidance of theory, Chen classified the diseases according to their causes: apoplexy, cold in the middle, summerheat stroke, dampness stroke, four properties, impediment diseases, arthritis, athlete's foot, common cold, disease caused by cold, Summerheat damage, dampness damage, pestilence, malaria and other diseases are caused by external factors; the second list is zang-fu organ Hanre diseases with deficiency and excess, which are caused by internal factors; the second list is diet Bleeding, blood stasis and other diseases caused by factors such as fatigue, trauma, etc. are not caused by internal or external factors. This method of classifying diseases by cause is of certain significance for deepening the understanding of the cause and pathogenesis and strengthening the pertinence of prescription and medication. .