The expert knowledge based on SCADA system of centralized control station was designed to realize fault signal automatic recognition and analysis and provide fast and reliable fault analysis report as well as fault recovery strategy. Fault information integration function can be convenient for attendant to undertake relevant information retrieval in fault cases. The system abnormal monitoring function can automatically find abnormal state of equipment and provide necessary alarm function. Combined with the application of typical accidents plan make the system realize all-in-one aided decision means in the case of centralized control station fault conditions.