A: In the study of local chronicles, while compiling local chronicles, Zhang Xuecheng paid attention to summing up the experience of compiling local chronicles, carried out theoretical construction of local chronicles, and wrote such papers as Discrimination of Local Chronicles, Three Comments on Local Chronicles, Comments on Dai Dongyuan's Editing Local Chronicles and Ten Comments on Editing Local Chronicles. Through the long-term practice of compiling local chronicles and the careful discussion on the origin, nature, style, function and compilation method of local chronicles, a set of systematic local chronicles theory has been formed, which has had a great influence on the study of modern local chronicles. To sum up, Zhang Xuecheng's view of local chronicles can be summarized as follows: it is the first time to put forward the view that local chronicles belong to history, scientifically define the nature of local chronicles, and clarify the nature of local chronicles. Li Baizhen said that he put forward such ideas as "local chronicles are a historical style", "local chronicles are a compilation of history", "local chronicles should be deleted as a national history", and "local chronicles are a whole history", which brought local chronicles into the scope of history books and considered that history books and local chronicles have the same nature and function. He said: "There is a history of the world, a history of a country, a history of a family and a history of a person. Biography and narrative, a person's history; Genealogy, the history of a family; The county annals of the Ministry of Finance are also the history of a country; Once you remember it, the history of the world is also. "

In bibliography, "all the six classics are history" is his general academic viewpoint, and "Tao never leaves the device" is the basis of his philosophical thought. He advocated the pioneering spirit of historical research and emphasized that literature should reflect objective reality. The contribution to classical bibliography is that the task of bibliography is to "distinguish academic chapters and examine the origin of mirrors", summarize the achievements of ancient bibliography, and put forward methods such as "mutual cooperation", "innovation" and "indexing", which is a high understanding of the contents and methods of catalogue description in past dynasties. It is believed that the classification of book catalogue should change according to the changes of the times; Be careful when cataloging, not one book and two books; The classification outline should be systematic, including all books. His bibliography thought of "chapter-distinguishing mirror" was gradually formed in the process of extensive analysis and study of previous bibliography and bibliography works, which had a great influence on later generations.