An evaluation of National Cheng Kung University (NCKU) Library's journal collection through citation analysis was carried out for the purpose of determining the extent to which it is supporting the needs of the academic researchers. In order to provide sufficient journal collections to fulfill research requirements and ultimately inform future collection development decisions, the study analyzed the articles published by the faculty members of the university and the affiliated hospital, and further counter checked with cited references and journal usage statistics. The results indicate that NCKU library offers a high level of research support with more than 80% of the citing and cited materials that are owned by the library.