Abstract: National Digital Library is the largest chinese digital information preservation base and the digital information service base in the world, it has built the distributed multi live storage system gradually, and it has realized the functions of storage, preservation and disaster recovery center.This paper analyses the storage system and storage architecture and storage strategy of National Digital Library, introduces the technology realization of storage system. At last, this paper put forward the future development of storage system.

Key words: National Digital Library, Distributed, Multi live, Storage system