Digital library system is a technology that collects high-value multimedia information such as images, texts, sounds, audio, images, movies, software and scientific data, organizes standardized processing, carries out high-quality preservation and management, implements knowledge appreciation, and provides high-speed cross-library connection electronic access services on WAN. It also involves solutions to a series of problems such as intellectual property rights, access rights and data security management.

Functions of digital library: The construction of digital library is based on unified standards and norms, with digital information as the bottom layer, supported by distributed massive resource pool, with intelligent retrieval technology as the means, e-commerce as the management mode, and broadband high-speed network as the transmission channel, which will deliver colorful multimedia information to thousands of households. It involves the whole process of production, processing, storage, retrieval, transmission, protection, utilization, archiving and elimination of digital information resources. Digital library is characterized by digitalization of collection, computerization of operation, networking of transmission, liberalization of information storage, sharing of resources and structural connection. To develop China Digital Library, we should actively organize Chinese information resources of libraries and relevant institutions to go online, so that China's long history, splendid culture, achievements in economic construction and progress in culture, education and science and technology can be actively and widely spread to all parts of the world through the Internet, occupy the field of Chinese information resources on the Internet, and expand the utilization and influence of Chinese information resources.