This research’s purpose is to analyze service quality of internet banking on client’s loyalty and the influence of the service quality (reliability, access, communication, credibility, and security) partially and simultaneously of Univeristy Muhammadiyah of Yogyakarta students as users of Syariah Mandiri Bank’s internet banking. This research uses quantity approach with purposive sampling, collecting data by giving questionnaire. There are 90 sample of respondent, with 30 respondent on first research for validity test and 60 respondent for research uses doubled linier regression data analyze technique. It shows 0.05 signification with determination coefficient result (Adjust R Square) 0.780 amounted 78 percent which means the service quality of internet banking has influence over client’s loyalty as users of BSM internet banking with 78 percent and the rest 22 percent caused by other factors.