The power centralized multiple unit is made of weath ering resistant steel,and the surface quality of the substrate before the anti-corrosion coating is the key to ensure the coating quality.Laser surface treatm ent,as a new type of non-contact surface treatment tech nology,is more in line with the national green tech nology development concept compared to grinding and sandblasting.Through the sam ple process test,the surface of the substrate after laser cleaning has good cleanliness and rough ness.In addition,under certain conditions,the adh esion of waterborne epoxy metal coating can reach more than 5 MPa after 24 hours of surface treatment,and the failure mode is cohesive failure of the coating.