The purpose of this study was to conduct the mobile OK test which means the web accessibility evaluation tool and to evaluate the public libraries' mobile web services. For this purpose, 81 public libraries were tested and analysed in Mobile Web Best Practices presented by W3C. The results of this study indicate the following several strategies: Support by local governments and provincial education offices, Design mobile web services corresponding with web standards, Removal of harmful elements in the web design process, Making simple mobile web documents, A merger of individual files. The findings of this study expect to expand and improve the public library mobile web services for future.