Refers to the ancient manuscripts and printed copies published in Dunhuang from the 5th to 1 1 century. In the 26th year of Guangxu reign in Qing Dynasty (1900), Wang accidentally discovered the Tibetan Sutra Cave, namely Cave 17, in the tunnel of Cave 16 of Mogao Grottoes. Later, western explorers Stein, Peliott, Otani Expedition and Odenburg followed closely, and a large number of documents and treasures were bundled away. 1909, the Qing government sent the looted documents to Beijing and deposited them in the Shi Jing Library in front of the National Library of China. At present, the National Library of China has 16000 pieces; The British Library has 13677 pieces; There are more than 7,000 pieces in the French National Library; There are more than 18000 pieces in St. Petersburg branch of Institute of Oriental Studies of Russian Academy of Sciences. In addition, Dunhuang Research Institute, Chinese History Museum, Palace Museum, Gansu Provincial Museum, Dunhuang Museum, Peking University Library, Shanghai Museum, Shanghai Library, Tianjin Art Museum, Tianjin History Museum, Chongqing Museum, Northwest Normal University, Taipei Central Library, Hong Kong Art Museum, Gulong University, Otani University, tenri university, Tokyo National Museum, Copenhagen Royal Library and other units have collections, totaling more than 50,000 pieces. At present, the Book of Ten Buddhist Monks (S.797) was first copied in Xiliang in the second year of its establishment (406), and at the latest, it was compiled into Hongzhi by Dunhuang King Cao Zongshou in the fifth year of Xianping in the Great Song Dynasty (1002) (32a). The age of Dunhuang suicide note can be determined from the aspects of paper, scale, calligraphy, inscription and content. Calligraphy in the Northern Dynasty was regular script, while that in the Southern Dynasty and Sui and Tang Dynasties was cursive script. From the end of the eighth century to the ninth century, paper written with wooden pens appeared, and folded clothes and brochures appeared in the late ninth century. Dunhuang suicide note can be divided into religious classics, official and folk documents, China's Four Books and non-Chinese documents. Dunhuang suicide note is an important research material for studying history, archaeology, religion, anthropology, linguistics, literature history, art history, science and technology history and historical geography related to medieval China, Central Asia, East Asia and South Asia.