Liveliness of any library is directly related to the rate of using its information services and resources. Studying the amount of the existing information resources used by faculty members, who account for a considerable portion of the library users, can be a positive step for promoting the quality of library services and resources. In this descriptive survey, 72 percent of research community (Iran University of Medical Sciences' Faculty Members) answered the research questionnaire. Findings indicated that the rate of Central Library use was 18.8% in 2005. This study investigates the problems preventing the use of library services and resources. Also, it probes into the rate of using existing services and resources in the Central Library as well as faculty ranking in terms of library use. Finally, according to the findings, there are some recommendations for promoting the quality of existing services and resources in the Central Library of IUMS.