The purpose of this study is to investigate the influence of teacher-librarians’ autonomy support on the school library users’ satisfaction and continuance intention. Based on SDT(self-determination theory), it focuses on the mediating effect of BPN(basic psychological needs) between the autonomy supports and the satisfaction of the school library users. A survey was administered to 331 middle school students and the research model was examined by using regression analysis and Hayes’ parallel multiple mediator model. The findings show that the teacher-librarians’ support for autonomy directly and indirectly has a positive effect on the students’ satisfaction with the school library, and perceived autonomy and competence among the sub-factors of basic psychological needs are found to have a significant mediating effect between the support of the librarian’s autonomy and satisfaction with the school library. In addition, students’ satisfaction with the school library shows a significant effect on the continuance intention. This study is meaningful in that it presents the role of teacher-librarians as a factor affecting students’ motivation to use school libraries and provides implications for revitalizing school libraries.