The National Museum of Korea is a nation's representative museum library that provides collection development, organizes, and utilize museum collections. Considering the limited budget, staffing, and users' awareness of the museum libraries in general, the role of the National Museum of Korea is vital. The purpose of this study is to establish the identity and development plan of the National Museum of Korea library as a specialized library. For this purpose, the current states of the National Museum of Korea library, preliminary studies, domestic and overseas case studies, and user & expert interviews were conducted. As a result of the study, the study suggested future directions to secure the professional identity of library, and development plans for collection, service, and human resources by museum library, and also to increase the role of library in museum and to improve users' awareness.