To solve the problem of a shortage of ancient repair paper, the China National Preservation and Conservation Center for Ancient Book launched a task for the production of custom - made repair paper for ancient books. The custom - made paper replicates ancient papers and is manufactured in the original production region as the ancient paper was, and use traditional crafts such as limewater immersion and sunlight bleaching. After two years of efforts, a variety of bamboo, bast and Xuan paper have been produced. Testing indicates that these papers meet quality requirements. This article reviews various categories of ancient paper, their classification and quality requirements. The advantages and disadvantages of using traditional crafts compared with modem handmade papers are discussed. Test results show that these custom - made papers are suitable for repairing ancient books.