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Capacitive equipments are very important in our power system. So it's very necessary to diagnosis the fault exactly. In this paper, according to grey relational analysis, a new capcitive equipment fault diagnosis method is present. It can calculate the grey relational degree between the tandelta and the temperature, humidity and catamination degree. Then get the fault type of capcitive equipment through campare the grey relational degree. This method is very easy using in the site. Finally, the application examples in the fault diagnosis of transformer are given which shows that this method is effective.