The information system evaluation represents the procedure of assessing how successfully Information System fulfills its objectives. There are many universities that start to develop and pay more special attention to information system as a source which facilitate the collecting and using information effectively. This study to evaluate the Letter Management System in the Civil Engineering Master Program, Lambung Mangkurat University. This study adopted The DeLone & McLean Information Systems Success Model for evaluating information system, which they classified in six main categories such as ; system quality, Information quality, Information manipulation, User satisfaction, individual influence, Organizational influence