This study develops a program for the Tani Hujau Makmur Cooperative in Tanggamus Regency, Lampung Province, to create a web-based cooperative accounting information system application in an effort to assist the community, particularly cooperatives. The application design method used is the prototyping method. The output of this research is a web-based application called SIKOP THM (Information System for the Tani Hijau Makmur Cooperative). This research is expected to have a real contribution to the world of cooperatives, especially in terms of digitizing information systems so that it can provide convenience for the managers of the Tani Hijau Makmur Cooperative in carrying out their business activities, and can even become a role model for the application of producer cooperatives which are still very rare, compared to other types of cooperatives such as savings and loan cooperatives and consumer cooperatives .