The reference service utilization study is a part of the reference service evaluation for the purpose of understanding the scope of demands and evaluating the library service efficiency through a survey of the library users. This paper aims to study by means of questionnaires the knowledge of the library reference service on the part of the faculty and students of the National Chengchi University, reasons for their utilization or disuse, the state-of-art of their utilization, their sense of satisfaction and workable suggestions.