Abstract: With the development of digitalization and network,digital information has become the important resource in library.How to take scientific and reasonable measures to preserve digital information effectively in order to serve readers better has become the issue which library circle should research seriously.Based on the outline of the meaning of the long-term preservation of digital information,this paper analyzes the factors which affects the long-term preservation of digital information,and puts forward several technology strategies.

Key words: digital Information; long-term preservation; information construction