Abstract: By investigating the specific contents of the Important formulas worth a thousand gold pieces of classification version from the Northern Song bureau for revising medical book, it is found that the official minister of Song dynasty comprehensively rearranged the book in accordance with the principles of similarity in content, reasonable logical relationships, rigorous classification, as well as uniformity in arrangement and style. In addition, the chapter structure became more rational, and the ordering of the information on the theory, method, prescriptions, and medicines became neater and more regular, which not only facilitated the understanding and practical use of the book, but also strengthened the application of the clinical prescriptions from the book. The classification revising method used by the official minister of Song dynasty has changed the basic composition of books, resulting in differences in academic connotations. On top of that, some of the previously proposed historical perspectives on medicine based on the revised books of Song dynasty need to be re-examined. To effectively use the documentary materials of the medical books from Song dynasty, the study and use of the medical books of Song dynasty requires a full understanding of the changes in the text caused by the classification revising method used by the official minister of Song dynasty.