This study aims to identify the concept of Knowledge management as considering it as one of the new management theory that many organization trying to apply it useful of his advantage, also the aim was to identify the Knowledge procedures and causes of return of libraries and information system to Knowledge management, in addition to identify requester of Knowledge management application in the libraries. The research design was the theory deism as most appropriate for this study. The results of this research show that there was no significant different between libraries duties, information systems, and Knowledge management procedures, also that the most important requisites of Knowledge management application in libraries was existing of three elements which are: organizational culture, organizational knowledge, knowledge management technology.