The purpose of this study was to determine the feasibility of the Covid-19 Supplement book on virus material and the effectiveness of the Covid-19 Introduction Supplement book in improving student learning outcomes. The development research method (Development & Research) produces products, so this research is oriented towards product development which has the process of describing it as well as possible and then its feasibility will be validated. In this study uses the ADDIE research model which includes the analysis, design, development, implementation, and evaluation stages. The subjects in this study were three expert validators (materials experts, linguists, and design experts), then teachers and class X students at SMA Negeri 1 Hutabayuraja. The results of this development research show that the Covid-19 Supplementary book on virus material was deemed appropriate by material experts, linguists, and graphic design experts, and the application of the Covid-19 Supplementary book on virus material can effectively improve student learning outcomes with student classical mastery of 75, 6%.