The main functions of a library have always been focusing on collecting and organizing information which already exists. However, creation and application of information such as "oral history" is much less mentioned. This article covers introduction for three professional organizations of oral history: "The Oral History Association", "Columbia University Oral History Research Office", and "The Regional Oral History Office of Bancroft Library, University of California, Berkeley". Three oral history projects, "The Oral History Project of Texas Library Association", "The New York State Library Oral History Project", and "The Greenwich Library Oral History Project" are also been discussed. The applications of oral history in library can be classified into: (1) collecting published material about oral history; (2)collecting published and semi-published oral history transcripts for research; (3)serving as a repository for unique oral history materials created by oral history projects outside the library; (4)establishing an oral history program in the library to create new oral histories. Some legal aspects should also be addressed such as contracts, libel, right of privacy, and copyright. Since one of the regional public library's function is to collect local historic resources, the best place to construct oral history projects, and to provide related training for librarians in Taiwan are the regional public libraries.