The purpose of the study is to examine prospective librarians' library practicum experiences by using Giorgi's descriptive phenomenological method. To achieve the purpose of the study, the study conducted in-depth interviews with the participants of the library practicum in the department of library and information science at the A university. Following Giorgi's four ways of phenomenological description, the study analyzed the collected data from in-depth interviews with the participants. Prospective librarians' library practicum experiences were able to analyze as five significant themes and seventeen sub-categories of the themes. The five main themes are as followings: 'formulating perception of libraries and librarians', 'formulating career design through self-development and challenges', 'growth and challenges in preparing the library practicum', 'growth and challenges in the middle of library practicum' and 'experiences after the library practicum and the evaluation.' On the basis of the findings, the study suggested alternative programs of library practicum and the directions for performing the programs effectively and efficiently.