Since the development of the information technology, there have been great changes in the functions and the nature of university library. This paper takes Tianjin Polytechnic University as a case study and attempts to make an investigation and analysis on the service quality of library by questionnaire. Based on SPSS 16.0 statistical analysis, this study revealed the status quo of readers’ satisfaction on the library service, analyzed the problems and made related strategies and suggestions in order to facilitate and enhance the library service quality.