With the development of the Internet and popularity of E-resources, the library websites are playing a more significant role. This study chose the National Taiwan University Library as the target. Four senior students from different majors, excluding Library and Information Science majors, were solicited for the usability test in this study. The user experience, realized by the observation and recording, was conducted with the questionnaires. The conclusions were divided into four parts: "vocabulary," "instruction," "Information structure," and "information system." According to the findings of this study, suggestions for National Taiwan University Library websites were given to improve the usability.