A library is a growing organization. So a library must keep up with the progresses of modern information technology in order to provide best services to readers. Modern information technology effects the librarianship in many facets, including: collection development, selection and acquisition, cataloging and classification, shelving and circulation, reference and consultant, outreach services and public relation, building and facilities, the roles of librarians, library cooperation, and library instruction. The effects may be good to libraries, but they may cause some problems. It is important for us to think how the information technology may be utilized by libraries.