Main countries, regions and international organizations in the world stress much on adjustment and reconstruction of library fair use system under digital network environment, the legislation focuses on restoring copyright balance, and library fair use space shows expansion trend. As required by Copyright Law of P.R.C., library fair use space is too narrow, which severly restricts functions of the library under digital network environment, is not easy for the library to access and disseminate litera- ture information resources, and needs modera...