The purpose of this study is to determine the problems that occur when the migration of library automation systems in the University of Sebelas Maret (UNS) Library, such as the causes, constraints, and advantages and disadvantages of the SLiMS automation system. This study was used descriptive method. Data collection method used in this study is the interview and observation. The obstacle faced by librarians in implementing SLiMS is that librarians who are not yet accustomed to need time to learn. Overall the implementation of the SLiMS automation system at the UNS Library went smoothly, although there were a number of problems, the library was able to overcome the problem. The results of this study revealed that the migration of the Library automation system to SLiMS was carried out to support the increasingly complex needs of users.