Abstract: Acrylonitrile-butadiene-styrene (referred to as ABS) with low density,good flexibility,easy machining,low cost,has been widely used in automotive,sanitary ware,household appliances and other fields.In order to improve the shortcomings of the traditional electroplating metallization modification technology on ABS surface this study adopted the dual-target magnetron sputtering coating technology with dry and eco-friendly characteristics to design and prepare CrCu composite modified coating on ABS surface.The effect of Cu content on the composition structure,color,mechanics and weather resistance of the coating was studied.The results showed that the content of Cu in the CrCu composite coating varied from 15.2 to 48.3 at.%when the sputtering current of the Cu target increased from 0.5A to 2A.All the coatings had a columnar growth structure,and Cu was mainly distributed in the lattice structure of Cr (110) in the form of a solid solution.With the increase of Cu content,the CrCu composite coating gradually changed from pure Cr coating silver white to light purple red,and the elastic modulus of the coating decreased,which was better matched with the elastic modulus of the substrate.However,due to the high content of Cu element,the hardness of composite coating decreased.In addition,the introduction of Cu in Cr coating can improve the weather resistance of metal coating on ABS surface.