Books in the library should not be marked. Books are the property of the public, and it is forbidden to smear, tear up or hide books and periodicals. Library is a public cultural institution that collects, sorts out and collects books and materials for people to read and refer to. It is the external storage and selective transmission mechanism of social memory, and the memory device and diffusion device of social knowledge, information and culture.

Cultural heritage:

Since the emergence of human society, there have been words, and there have been carrier books used to record these words. It records the development and evolution of human history since ancient times. One of the functions of the library is to collect, process, arrange and scientifically manage these precious literature resources for readers to borrow and use. The library exists as an institution to preserve the cultural wealth of all ethnic groups, and its task of preserving human cultural classics is the oldest function of the library. It is based on literature and carries out commercial activities. However, due to the realization of computer networking and the rapid development of science and technology, libraries not only save handwritten and printed documents, but also save other carrier resources, in order to make better use of them.