electrical control system on the ship also constantly updated, electrical equipment used are becoming increasingly complex. Long ship floating in the sea, due to the larger marine environment of humidity, strong alkaline seawater, and electrical equipment often by ship shock, the impact of external forces, the probability of failure of a large electrical equipment. Thus, timely detection of failure of electrical equipment, effective troubleshooting, is the most important marine electrical operation and maintenance work. Most vessels using expert systems approach to analyze electrical faults, but also as a manager of its own experience of the fault analysis and processing.