Normally,diarylamines and Schiff bases can act as the traditional radical scavengers carrying peroxyl radicals(ROO·)to protect lubricant from oxidation [1,2].To improve antioxidant activity,a novel bifunctional antioxidant which combined imino moiety and diphenylaminic moiety into one molecule has been designed,and the superior antioxidative capacity comparing with corresponding diphenylamine has been confirmed.