The purpose of this study was to investigate the relationship among quality of service, consumer satisfaction, and consumer loyalty. Subjects were consumers selected from seven Taipei Sports Centers. Three inventories were utilized for data collection including (a) Quality of Service Inventory; (b) Consumer Satisfaction Inventory and (c) Consumer Loyalty Inventory. Totally 420 copies of questionnaires were collected, 60 for each Taipei Sports Center. The number of effective samples was 409 and the retrieve rate was 97.4%. The retrieved questionnaires were analyzed by Statistical Package for the Social Sciences for Windows 15.0 and LISREL 8.52 for Windows. The results of this study were as following: consumer satisfaction was higher when quality of service was higher, consumer loyalty was higher when consumer satisfaction was higher, and the quality of service will not affect consumer loyalty directly, but it will affect consumer loyalty indirectly through consumer satisfaction. Therefore, consumer satisfaction is a mediator.