Equipment maintenance management task is not only the element task of management of a safety production, but also the guarantee of long-term reliable operation for a power generation enterprises. In this paper, aiming at the equipment maintenance management of power enterprises, selecting the feed water pump system as the research object and using the data mining to do the fault prediction of equipment, meanwhile this paper did some improvements of Apriori algorithm in association rules and also did some optimizations of database scanning and connection with pruning. Finally testify the conclusion demonstrated by the paper.