Introduction to the Sutra Cave: Cave 17, now numbered, was discovered by Taoist priest Wang Yuanlu in 1900. It contains documents, paper paintings, silk paintings, There are more than 50,000 pieces of embroidery and other cultural relics, which have important historical data and scientific value for the study of the history of China and Central Asia. This has formed a discipline that mainly studies the scripture cave documents and Dunhuang Grotto Art - Dunhuang Studies. .