The coated tool combines the advantages of high strength, high toughness and high hardness and wear resistance of the substrate, which improves the wear resistance of the tool without reducing its toughness. Wide range of coating tool versatility, the processing range significantly expanded, the use of coated tools can get significant economic benefits. A coated tool that can be used instead of several uncoated tools can greatly reduce tool variety and inventory, simplify tool management and reduce tool and equipment costs. However, after the tool is coated in the existing coating process, the coating material has a large internal stress due to the difference of the material properties of the coating material, the large internal residual stress of the coating, the low bonding strength between the coating and the substrate, the easy peeling of the coating, And the coating process also caused the matrix strength decreased, coating blade re-grinding bad, complex coating equipment, expensive, high process requirements, coating a long time, the cost of cutting tools and other shortcomings.