This study examines the usefulness and user acceptance as well as the ease and acceptance of users who are using version 2.7 UNSLA in sebelas maret university surakarta. In this study the authors used a quantitative method that a study was conducted to determine one aspect of the research objectives widely used in data collection techniques although pengambilan samples. In quantitative research, the results may apply generally to all target areas of research. Results of the research that the usefulness factor (preceived usefulness) have significant positive effect on user acceptance (user acceptance) and usability factors (perceived ease of use) has a significant positive effect on user acceptance (user acceptance). Thus, the library staff and library employes in the UNS believes that the information system useful for their work can affect the improvement of their work can affect the improvement of their acceptance of such system.