Restoration of ancient books is a special skill. In the long course of history, fragile ancient books have been scattered and transferred, and destroyed by natural disasters and wars. Most of them are riddled with holes and in tatters. "Repairing the old as it is" and turning decay into magic are important links in protecting the integrity of ancient books from past dynasties. Therefore, people from all walks of life praise this skill as the "life-saving soup" of ancient books. To engage in the restoration of ancient books, one must not only be familiar with the form and version of books from various dynasties, but also understand the paper, book cover and binding style of each dynasty, and have skilled skills. Repairing an ancient book often requires more than a dozen or even dozens of processes, and each move is extremely sophisticated, and the requirements for the personnel engaged in the restoration of ancient books are even more demanding. The National Library of China is a comprehensive research library, the national general library, and the national bibliographic center. Its collection can be traced back to the Southern Song Dynasty, and the library has many precious ancient books. The National Library has a long history of document restoration work, and document restoration personnel were equipped as early as the Beijing Library period. In 1949, in order to repair the Zhaocheng Golden Collection, a national treasure that had just been collected by the Peking Library, a restoration team of 8 technicians was established with the approval of the then Military Control Commission, which is the predecessor of today's National Library Restoration Group. In 1953, the "Book Restoration Group" was officially established. Since then, the restoration of ancient books has embarked on a professional and regular development path as a full-time business of the library. In 2001, the "Book Restoration Group" was renamed the "Rare Books and Special Collections Restoration Group". The National Library's document restoration work has achieved relatively brilliant results in history. The restored national treasure-level precious documents include the Zhaocheng Golden Collection, the Yongle Encyclopedia, the Western Xia documents, some Dunhuang manuscripts and rare books from the Song and Yuan Dynasties, and the Qing Dynasty's "Fuyi Complete Book". It can be said that it is with the unremitting efforts of generations of National Library book repairers that the charm of each national treasure in the collection can be re-presented to the world. Beijing Yiyatang is a century-old brand famous for mounting and restoring ancient books, steles, calligraphy and paintings. It was opened during the reign of Emperor Guangxu in the Qing Dynasty, and the owner was Ding Mengsong. In the late Qing Dynasty and early Republic of China, Yiyatang was very famous in Beijing for its mounting skills. At that time, many mounting masters in Beijing came from Yiyatang. In 1958, Yiyatang was owned by China Bookstore, and three generations of mounting inheritors worked hard here to repair more than 300,000 damaged and precious ancient books, including rare and solitary books. At present, the situation of ancient book protection is very serious. At present, there are more than 10 million ancient books that need to be repaired in libraries, museums, and cultural relics management units across the country. However, according to statistics, there are less than 100 talents in ancient book restoration in libraries across the country. In addition to the serious shortage of talents, there are also problems such as low comprehensive quality, low professional titles, and old age. It is urgent to protect the skills of ancient book restoration.