Bimetallic materials combine the characteristics of two kinds of metal and exhibit superior properties, which is widely concerned in the field of material applications. Preparing high performance functional materials at low cost is the key to the promotion and application of bimetal. Using Cu₃₀Mn₇₀ alloy as precursor, gold coated nanoporous copper substrate (Au@NPC) was fabricated by free corrosion and subsequent chemical plating. In addition to limiting the oxidation of copper in air, the gold coating reduces the aperture distance between ligaments, increases the electromagnetic coupling effect between adjacent ligaments, and make Au@NPC have stronger local electromagnetic field enhancement characteristics, which is better than the surface enhanced Raman scattering characteristics of nanoporous copper. Gold-copper bimetallic materials can be used as surface Raman enhanced scattering substrates with excellent stability at low cost.