Micro-arc oxidation technology introduces the working area from Faraday area of ordinary anodic oxidation to high voltage discharge area, which overcomes the defects of hard anodic oxidation and greatly improves the comprehensive properties of the film. The micro-arc oxidation film has the advantages of firm combination with the substrate, compact structure, high toughness, good wear resistance, corrosion resistance, high temperature impact resistance and electrical insulation. This technology has the characteristics of simple operation, easy adjustment of membrane function, uncomplicated process and no environmental pollution. It is a brand-new green surface treatment technology of environmental protection materials, which has broad application prospects in aerospace, machinery, electronics, decoration and other fields.