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In order to solve the problem of difficult to find the new equipment faults, the reasoning mechanism based on Built-In Test (BIT) diagnosis and fault cases diagnosis integration was introduced into equipment fault diagnosis. The BIT diagnosis was taken as leading. The fault cases diagnosis was taken as post supplement. The advantage of equipment BIT system and fault case knowledge extracted from the maintenance records was taken. The integration fault diagnosis system was designed to improve the accuracy and efficiency of fault diagnosis. The effectiveness of BIT and fault cases fusion diagnosis method was verified by fault diagnosis example analysis of a certain type gun fire control system.