According to actual engineering requirements on state repairing of a relay protection system of an intelligent substation, the invention puts forward a state-monitoring-based repairing method for a relay protection system of an intelligent substation. According to an operation state score of an element, whether the element is in a normal working condition or an abnormal condition is determined; with consideration of the influence of a service age repairing roll back, a degradation threshold (DT) model based on a long-term evolution rule and a degradation shock (DS) model based on a short-termsudden change rule are established respectively; and then a comprehensive risk model of the relay protection system is established by combining the configuration situation of the protection system andthen repairing strategy plans of all elements of the relay protection system are made. Therefore, actual needs of state repairing of the relay protection system of the intelligent substation are met.