The restoration of ancient books is a unique traditional technology in China, and it is also one of the main measures to protect ancient books in China. According to textual research, its origin can be traced back to this week's Tibetan room at least. After long-term practice, craftsmen of all ages have created superb skills in the restoration of ancient books, which have been passed down to this day. The repair technology of ancient books appeared with the appearance of binding technology and developed with the development of binding technology. The purpose of ancient book restoration is to prolong the "life" of ancient books. The most fundamental principle for the restoration of ancient books is: "Preserve the old as before, and preserve the original appearance".