Abstract: By using the service quality loop and quality function deployment (QFD) method, a service QFD measurement model for a systematic two-step service design process is built. At the same time, a fuzzy evaluation model of service importance elements (quality factor) is established. Detailed study is conducted for a university library service system. It identifies the critical service elements and quality factors to be improved in the library service system design so as to improve the quality of library services.