Abstract: Using H2SO4, H2C2O4 and C7H6O6S·2H2O as the basic electrolyte containing nano-SiC particles of 3, 8, 12 and 15 g/L, respectively, anodic oxide Al2O3 films with nano-SiC particles were prepared on the surface of a 2024 aluminum alloy by using optimal operating parameters. The results showed that the hard anodic oxide Al2O3 films reinforced by nano-SiC particles were formed. With increasing the content of nano-SiC particles in the electrolyte, the thickness of the composite oxide films increases from 42 μm without the nano-SiC additions to 48 μm, and the hardness increases first and then decreases. When the nano-SiC addition was 12 g/L, the composite oxide film exhibits the highest hardness 440 HV and the minimum wear loss 8mg. The hardness of the composite oxide film increases from 400 HV without nano-SiC additions to 440 HV, and the wear loss decreases from 25 mg to 8 mg. Nano-SiC particles enter in pores of anodic films during mechanical mixing and adsorbing in the processes of anodic oxidation, and then the microstructures of films were changed, the hardness and the wear resistance of the films are also improved.