This study aims to explore the participation of the elderly in voluntary services in public libraries. The subjects for this study have been chosen from the elderly volunteers of the Taipei Public Library. The research questions attempt to investigate the followings: the motivations and purposes of elderly participation in volunteer services, the factors that influence their choices of entering the public library service, and the experience of volunteer services. This study uses a semi-structured interview and a small questionnaire to collect data. In order to obtain a comprehensive understanding of the research subjects and to interpret the research results appropriately, the findings have been supplemented with the background information of research subjects collected from personal profile forms to achieve the relevance to the volunteer services experience of elderly participation. The total of 30 elderly volunteer aged from 56 to 85 have been interviewed. Based on the research findings, the authors propose a framework for understanding elderly volunteers participating in public library services, and offer suggestions to voluntary service units of public libraries and elderly volunteers.