Composite oxide FeO2/Al2O3-supported gold catalysts were preparod by a modified two-step method.The effects of preparation conditions on the initial catalytic activity and long-time stability were studied for CO oxidation.XRD,XPS and in situ FTIR were employed to investigate the state of FeOx and the species on the catalyst surface.The results showed that Au/FeOx/Al2O3 catalysts prepared by this method exhibited high activity and high stability in a wide pH value range.Calcination pretreatment was proved to be beneficial to improving the activity and stability.The beneficial effects of FeOx acting as a structural promoter could be ascribed to the ability to supply active oxygen species.As the precursor of FeOx,Fe(NO3)3 is superior to FeCl3 for obtaining higher stability.