This research is motivated by the lack of variety in learning media and low learning outcomes in Mandarin subjects. The purpose of this study was to produce appropriate and effective interactive multimedia-based learning media for improving student learning outcomes at SMA Santo Thomas 1 Medan. The type of research used is the development model of Borg and Gall. The research instruments used were initial needs questionnaires, material expert validation questionnaires, media expert questionnaires, and student response questionnaires. This study also uses quantitative data analysis techniques (data on the feasibility and effectiveness questionnaire assessment) and qualitative data (observation data and documentation). Product validation results show a score percentage of 88.23% for material expert validation, 89.41% for media expert validation, 90% for design expert validation, and 94.31% for student responses. The results of the normality and homogeneity tests show that the research data has been declared normal and homogeneous. The results of the hypothesis test show that the value of t count is 1.89 and the value of t table is 1.66, where t count > t table. The results of this study indicate that this interactive multimedia-based learning medium is effective in improving student learning outcomes at SMA Santo Thomas 1 Medan.