During the Qianlong period of the Qing Dynasty, more than 10,000 abstracts were compiled in the "Summary of the General Catalog of the Complete Collection of Siku". In fact, about one-third of the books were included in the "Quanshu of the Siku", and two-thirds of the books were only " Keep an eye on it.” When Du Zexun discovered the "Four Inventory Notes" in Liulichang, he decided to take the "Four Inventory Notes" as his own responsibility and began a long process of collecting information.

From May 25 to 31, 1992, the third national ancient books compilation and publishing planning meeting was held grandly at the Xiangshan Hotel in Beijing. After the meeting, Du Zexun stepped up his work on the "Four Inventory Target Annotations" and drafted the "Four Inventory Target Annotations" and sent it to some experts in the field of ancient book compilation for advice. At that time, Mr. Zhao Shouyan and Mr. Fu Xuancong of Zhonghua Book Company immediately responded to the letter and gave full consideration. Mr. Huang Yongnian, Mr. Zhang Peiheng, and Mr. Zhou Xunchu also gave affirmation and enthusiastic encouragement on different occasions. On April 20, 1993, Du Zexun published "Annotations on the Four Cunmu · After Yi Lei Shu" in "Ancient Book Briefing", which gave an outlook on the survival and edition status of all "Cun Mu" books from the Yi Lei annotations.

In May 1994, the compilation committee of the "Sikuquanshu Catalog Series" was formally established. Mr. Ji Xianlin, president of the Oriental Culture Research Association, served as the chief editor, and Du Zexun served as the standing editorial board member. They were invited to Peking University to serve as cataloguers. Deputy Director of the Office, and soon became Director of the Editorial Office. By the end of October 1997, all 1,200 volumes of the book had been published, and 4,508 kinds of "Cunmu" books had been collected, the vast majority of which were rare books. In November, Du Zexun returned to Shandong University, and based on the suggestions of Mr. Huang Yongnian, the academic consultant of the "Cunmu Series", he started the work of clearing the draft of "Four Inventory Target Notes". Mr. Ji Xianlin once praised Du Zexun's "Cunmu Notes" for "making a great contribution" in compiling the "Cunmu Series".

In the past five years, Du Zexun has undertaken a heavy teaching workload, offering "philology" courses for Shandong University's School of Liberal Arts, School of History and Culture, and Research Institute of Literature, History and Philosophy (graduate students majoring in literature, history, and philosophy at Shandong University) (Compulsory course), offering courses such as catalog edition proofreading, Qing Dynasty catalog edition study, and Siku studies for graduate students majoring in classical philology. At the same time, he participated in several collective projects. He personally wrote and published the "Outline of Philology" to meet the needs of teaching. "(published by Zhonghua Book Company in 2001). Du Zexun believes that to engage in academic research, one must lay a solid foundation and the other must be good at capturing information. “Many people now like to find information on the Internet and think that the information must be modern or even foreign. I think it is too narrow-minded. , Information is everywhere, the key is to capture it yourself, and be good at capturing it." This is Du Zexun's experience. Third, we must seize opportunities. To choose the right topic, you must have the conditions to do it well. Without the conditions, a good topic is useless. Fourth, be patient. For such a big project, accumulating bit by bit, examining each item one by one, and describing it word by word, was much slower than a snail. His teachers, friends, and knowledgeable people were all worried about him, and even kindly advised him to "publish a book first." ” in order to evaluate professional titles. He never wavered, on the contrary, he was fascinated by it. In February 2002, Professor Zhou Jiming wrote in the article "200 Years of Siku Studies": "Associate Professor Du Zexun of Shandong University has done a lot of research on the "Sikuquanshu Catalog". "The lost and remnants of the Shujinchengben", "Zhijianlu of the Shikubi Shujinzhenben", "The Notes on the Objectives of the Siku", etc., all have the meaning of specialized learning, which is eye-catching and expected." 2007. , the 2.7 million-word "Four Inventory Target Notes" finally meets readers.