Telkom University Open Library's official website is an Open Library service belonging to one of the universities in Indonesia, Telkom University. Usability of a website can be a benchmark for assessing how well and accessible it is for users. As users of the Telkom University Open Library website, students want convenience and a good experience while using the website. A variety of survey methods are available to test and assess the usability of websites. This study conducted tests using the System Usability Scale (SUS). The initial SUS result showed that Telkom University Open Library website has a poor score, therefore improvements are needed to increase this value. User-Centered Design is a design method that can be used to overcome the website's usability since it is based on the needs and interests of users. The result of this research is a prototype of Telkom University Open Library website for student's module. The prototype with the proposed design was tested using the System Usability Scale (SUS). The test resulted in a SUS score of 84.75. The score obtained is in the "acceptable"category and indicates that the application design tested to all test participants already has an improved usability score. © 2023 Author(s).