Based on Fault Information Processing System, the relay protection status evaluation system brings about an application programme for the maintenance of power grid secondary equipment status, including feasibility, evaluation rules, implementation approach and procedure, warning mechanism, as well as practical application. Through analyzing the information data type that used for evaluating the protection status, it helps research the relay protection status evaluation approach and warning mechanism, and offers a complete design scheme for relay protection status evaluation system which is based on Fault Information Processing System. In this way, the whole process management from data reading, data analyzing, status analyzing, and value calculating to warning and reporting process is realized. The application results on Foshan power network has proved it to be valuable for popularizing and applying in some certain area.