Abstract: Working temperature of turbocharger housing material increases steadily due to increasing technique demands. High-temperature oxidation resistance at 500-900 ℃ of two kinds of ductile iron, high-nickel ductile iron and QT400-18, was studied by gaining in weight method. Morphology and phase analysis of oxidation resultants were investigated using XRD and SEM. The results indicated that, high-temperature oxidation resistance of high-nickel ductile iron was obviously better than that of QT400-18, and the main resultants of the former were Fe2O3 and Fe3O4, which were characterized by a good oxidation protection on the substrate. Based on evaluation of oxidation resistance of materials, high-nickel ductile iron could been applied as a turbocharger housing material worked at 900 ℃. But for QT400-18, the resultants were Fe2O3, Fe3O4 and FeO when oxidation temperature was over 700 ℃, and the oxidation films were characterized by a poor oxidation protection on the substrate.