In order to protect books. Xi 'an Library is an important cultural place in Xi 'an, with a large flow of people. In order to prevent security problems, it is not allowed to put bags, mainly to protect books. It is forbidden to bring backpacks and other items into the library. Libraries should have this rule to prevent people from taking books out. At the same time, the library also provides a room for storing items. If you have any additional needs, you can go to the storage room to store them before entering the library.