Digital libraries and knowledge management are Current topics in present information age. The paper focuses the main concepts and ideas of Digital Library and Knowledge Management, and how to realize such ideal environment for users to make the needed knowledge available. Many technologies and precautions are explained for a more effective promotion in the development of the DL. And also explained the Knowledge management and frameworks, Tools for KM in Libraries, Importance; Key aspects; Characteristics of knowledge management and KM in libraries and information centers in detail study