Objects cast iron surfaces of the heat treatment is to improve the antiwear properties of cast iron. Processes such as induction heating quenching, laser heating quenching, and soft nitriding in steel are all suitable for cast iron. At present, the cylinder liners of diesel engines and internal combustion engines are often treated by laser heating quenching or soft nitriding. Laser heating cast iron parts have a fast heating speed. After air cooling, the workpiece can form a hardened layer of high-carbon martensite structure, so the wear resistance is greatly enhanced. After the iron casting is soft nitriding treatment, a layer of e-phase compound (Fe2-3N) high hardening layer is formed on the surface, which not only has high hardness, but also has a small friction coefficient, so the wear resistance of ductile casting is greatly improved.