This study focuses on exploring and analyzing the key roles of the library for a university through university ranking index, an important determinant of the success and reputation of higher education institutions globally. By evaluating the roles, missions and services provided by the library, the study identifies specific factors by which the library can influence rankings through supporting research and publication activities. This research utilizes real-life examples from leading universities to generalize important trends, while also highlighting the opportunities and challenges libraries face in contributing to the comprehensive success of a higher education institution. Analysis of surveys and models has demonstrated that libraries not only significantly enhance the online presence index of universities but also act as a major driving force behind research and educational activities. Finally, the study suggests the need for coordination between faculties, departments, and the library, emphasizing the necessity of policies that enhance the library's impact to maximize its role. This includes establishing policies that allow the library to play a central role in supporting research and teaching. Libraries should be empowered and resourced to actively participate in the development of research projects and training programs, while also providing consulting services and support for teaching, research, and publication for faculty and students.