This study aims to explore the service use patterns, user satisfaction and service quality in a university library. We use one university library as the case, which allows more attention to the detailed structure of the service system. This study analyzed the dimensions of user satisfaction for evaluating service quality, explored the differences among different groups of users, and provides suggestions for quality improvements. The findings of this study show that the attitude of the librarian, the capacity of the self-study seat, the open time as well as the novel of collection of books should to improve to increasing the overall satisfaction of the library. Results of this study provided a valuable reference for the present university library.