silks can be spun from above materials and the substrate 100 can be woven from the plastic silks in the present embodiment the substrate 100 is made of carbon fiber and a thickness of the substrate 100 is in a range from about 1 micrometer to 100 micrometers the substrate 100 is a rectangular shaped sheet however it is understood that the substrate 100 can also be threadlike or club shaped in order to remove dust and smear attached on the substrate 100 the substrate is processed using plasma or an acid solution in step 2 an metallic layer 200 is formed or disposed on a surface of the second portion 120 referring to fig4 and 5 the metallic layer 200 is connected to the first portion 110 and is configured for improving distribution uniformity of an electroplated layer formed on the surface of the first portion 110 during a sequential process for electroplating the electroplated layer on the surface of the first portion 110 the metallic layer 200 formed on the surface of the second portion 120 is functioned as an electrode thus the electroplated layer with high distribution uniformity is formed in a width direction on a surface of the first portion 110 near to the metallic layer 200 generally in order to ensure a current distribution density in a width direction of the first portion 110 a width of the metallic layer 200 is equal to or larger than that of the first portion 110 and the second portion 120 in this embodiment the substrate 100 is a carbon fiber cloth the first portion 110 and the second portion 120 have a same width electrically conductive silver pastes are coated on entire surfaces.