Abstract: Two kinds of SiCp/Al composites with volume fraction of silicon carbide(17vol% and 55vol%) were treated by micro-arc oxidation. The microstructure, morphology, phase composition of micro-arc oxidation film on the two materials were analyzed. The roughness, microhardness, bonding force of films were measured. The wear and corrosion resistance of films were investigated. The results show that the content of SiC has an effect on the surface morphology, roughness, phase composition, bonding force and wear resistance of SiCp/Al composites. The micro-arc oxidation film of 17vol%SiCp/2009Al composite is flatter than the 55vol%SiCp/6061Al composite, and the pore size is more uniform. The micro-arc oxidation films of both materials contain elements such as Al, Si, O, C, and W. The roughness of the 55vol%SiCp/6061Al composite micro-arc oxidation film(3.308 μm) is larger than that of the 17vol%SiCp/2009Al composite (2.140 μm), and has more surface melt. The micro-arc oxidation film of 55vol%SiCp/6061Al composite has more mullite phase, α-Al₂O₃ phase and β-Al₂O₃ phase. The combination of micro-arc oxidation film and matrix of 17vol%SiCp/2009Al composite(38.55 N) is better than that of 55vol%SiCp/6061Al composite (11.5 N). The micro-arc oxidation film of 55vol%SiCp/6061Al composite has large friction coefficient and serious wear. The corrosion resistance of SiCp/Al composites is improved by micro-arc oxidation treatment.