Synergistic effect of FeVO4 with α-Fe2O3 was found in Fe-V-O catalyst,which was responsible for the high apparent formation rate (A.F.R.) of benzaldehyde in liquid phase oxidation of toluene by hydrogen peroxide.The synergistic effect might create VOx species as active sites; moreover,it improved the reducibility and the reactivity of Fe-V-O catalyst.In order to gain the high A.F.R.of benzaldehyde,the catalyst should have the moderate reducibility.