This article is based on the use of learning models that are limited to the subjects of Kapita Selekta Mathematics. This article aims to explore the results of the development of a website for learning Kapita Selekta Matematika (KSM) on UIN Suska Riau students that is valid, practical and effective. This research uses a development research model of Borg and Gall. The research instruments used in this article are validation sheets (validity aspects) by involving 6 validator lecturers, lecturer assessment sheets and student assessment sheets (practical aspects) involving 5 students, and student learning outcomes tests (aspects of effectiveness) involving 28 students. The data in this research is analyzed using quantitative and qualitative descriptive. This results in a course learning website which is valid (the average overall aspect of material validation was 4.15 and the average overall aspects of validation technology is 3.98), practicality score is 4.23 with the category “GOOD”, and effective (Sig. 0,000 <Sig (1-tailed) 0.05). Thus, student-learning outcomes after using the learning website are better than before using the learning website. Based on the tests carried out, the development of the overall learning website on the material and technological aspects can be categorized as feasible, while the practical aspects can be categorized as practical, so this learning website can be used as a learning medium to help the learning process.