The library at SMK Negeri Sukoharjo is a library that has library management staff and the number of book collections according to library standards and has adequate library facilities and infrastructure. Students are required to become members of the school library to support the learning process. However, the process of borrowing and returning books is still conventional, namely all library administration data collection in borrowing and returning books is still written in the book, and when looking for the data needed, you have to open the book page. The implementation of the library administration information system using FAST (Framework for the Application of Systems Technique), users can better understand and easily use applications made to maximize the performance of library staff, principals, and students in managing library administration. The design of the library administration information system using FAST (Framework for the Application of Systems Technique) at SMK Negeri Sukoharjo has Scope Definition, Problem Analysis, Requirements Analysis, Logical Design, Decision Analysis, Physical Design, Construction and Testing, Installation and Delivery, and Prototype. according to the needs of users in the administrative information system library based on the user experience design carried out. The results of testing the criteria for the DeLone and McLean criteria for the success of the information system model are 88.31% with very good criteria.