Han Shu Literature and Art Annals, Sui Shu Economic Annals and Han Shu Literature and Art Annals are the earliest existing book catalogues in China. It is one of the Han Shu written by Ban Gu in the Eastern Han Dynasty, which records all kinds of books collected by the state in the Western Han Dynasty and is an important reference for us to understand the development and changes of academic culture from ancient times to the end of the Western Han Dynasty. Economic History of Sui Shu is the second existing book catalogue in China. It is one of the Sui Shu compiled by Wei Zhi and others in the early Tang Dynasty, which records all kinds of books collected in the Sui Dynasty and is an important reference for us to understand the development and changes of academic culture from the Eastern Han Dynasty to the Sui Dynasty. Although Han Shu Literature and Art Annals and Sui Shu Classics Annals both adopt the book classification of Liu Xin's Seven Laws, there are some differences. ? The book classification of Han Shu Literature and Art Annals basically adopts the book classification of Liu Xin-qi's view, and divides books into six categories: six arts view, philosophers view, poetry view, military book view, numerology view and Ji Fang view. Compared with Liu Xin's Seven Laws, Hanshu Yiwenzhi only lacks a part of "compilation". Yan Shigu said in his note that "set and set are the same, which means the general purpose of all books", which is equivalent to the general sequence or head of "six essentials", similar to the precedent of the first article when writing works today. Although Han Shu Literature and Art Annals lacks a summary, the general preface and the minor preface in its records also play the role of a summary. Therefore, to a certain extent, The History of Han Art and Literature is basically the inheritance of Liu Xin's Seven Laws. ? On the other hand, the book classification method of Sui Shu Jingjizhi is "teaching Qilu by borrowing Qilu" (Textual Research on Sui Shu Jingjizhi by Yao Zhenzong), and it also inherits the four-division method of Li Chong's four books, and classifies books by four categories: classics, books, history and collections. Compared with the six-point method in Historical Records and Sui Shu Biography, this four-point method has obvious progress, is more complete and practical, can objectively reflect and adapt to the development and changes of books under the historical conditions at that time, and is a more scientific book classification method. This book classification has been used for thousands of years in the classification of public and private books since then and has become the mainstream of classical catalogue classification in China. ? Similarities and differences between Han Shu's Literary Annals and Sui Shu's Economic Annals. Tong: Systematically speaking, it inherits the Korean tradition, which is orderly, with titles and small notes. In all departments and categories, the preface is to imitate Han, briefly explaining the academic origin and evolution of various schools. Difference: the establishment of "four categories" method, subdivision of small categories, so that the quartering catalogue has a complete system. These include books collected in the Liang Dynasty but lost or incomplete in the Sui Dynasty, so that future generations can see the existence of Liang's books and classics since the Liang Dynasty. It has the dual functions of "preserving the imperial edict and judging the mistakes", which is an innovation of Sui and also superior to Han. In a word, Hanshu and Sui Shu Jingji are not only the oldest extant two bibliographies, but also two landmark works of China's bibliography. In these two books, we can not only see the convergence and divergence of ancient and medieval classics, the academic development and changes, but also see the development process of bibliography from six to four in China. Defining the research object of historical philology is mainly all historical documents in Chinese and national languages with historical value at all times and all over the world. Historical philology is a comprehensive knowledge to explore and study the generation, development, expression and circulation of documents, as well as the content categories, arrangement and utilization of documents and even the digitization of documents, to elaborate its development law, to sum up its practical experience, and then to make theoretical explanations. Historical philology is a discipline with profound cultural background and broad development prospects. There are four main research areas:

1. Theory and method of historical philology: including the determination of discipline attributes, the construction of discipline system and philology methods.

2. The history of historical philology: including the historical context of the emergence, development, prosperity and change of philology, as well as the achievements and characteristics of each stage.

3. China's ancient ideology and culture: including the historical context of the occurrence and development of ancient academic ideology and culture, as well as the achievements and characteristics in various stages, especially in the Qing Dynasty.

4. Document arrangement: including cataloging, editing, arrangement, compilation, identification and document digitization. The nature of the discipline (1) Historical philology is a comprehensive discipline.

(2) Historical philology is a branch of history.

(3) Historical philology is a branch of philology. The characteristics of historical philology are comprehensiveness, foundation and practicality.

The so-called comprehensiveness refers to the research object, field and theory of China's historical philology. Methods involve both history and classical philology, and are closely related to philology, phonology, exegetics, chronology, historical geography, ancient literature, the history of China's philosophy, and the history of science and technology. Although comprehensiveness is not the disciplinary nature of historical philology, it is indeed a major feature.

The so-called foundation refers to the basic position of historical philology in the historical structure system. The study of history must be based on historical materials. Although the scope of historical materials is very wide, the historical documents handed down from generation to generation and unearthed are undoubtedly the most important part.

The so-called practicality means that historical philology is a knowledge that emphasizes practicality and practicality. Whether sorting out or studying historical documents is a very practical work, such as edition, catalogue, collation, discrimination and compilation. It takes a long period of hands-on practice and experience accumulation to succeed. The whole discipline of historical philology is gradually formed on the basis of long-term practice and experience accumulation in historical documents.