This study aims to determine the development of the process of mathematics teaching materials based on the Experiential Learning model to improve mathematical literacy skills in two-variable linear equation system materials as well as the level of validity, practicality, and effectiveness. This type of research is Research and Development regarding the ADDIE development model, which consists of several stages: Analysis, Design, Development, Implementation, and Evaluation. The product developed as teaching materials is a module based on the Experiential Learning model on the material of a two-variable linear equation system. The test subjects in this study were grade VIIIA students of SMPN 45 Makassar, totaling 28 students. The instruments used in this study were expert validation sheets, student response questionnaires, teacher response questionnaires, observation sheets of teacher ability in managing learning, observation sheets of student activities, and learning outcome tests. The results showed that in the limited trial stage, teaching materials based on experiential learning on two-variable linear equation system material had met the criteria of validity, practicality, and effectiveness.