Abstract: This paper analyzes the actualities of domestic real-time reference services,discusses the requirement and feasibility of developing real-time reference services system based on video-conference system in library.Considering the status of library,it proposes the model structure and the realization of the video real-time reference services based on SIP and the development aspects of video-conference real-time reference services in library.

Key words: session initiation protocol;library;video-eonferenee;referenee services