The copper clad aluminum alloy wire (CCAA) has many advantages such as good conductivity, high strength, strong solderability, low aluminum density, easy processing, and the like, and has a copper layer with uniform density, high compactness, and high stretch. Features such as sex. This bimetallic composite wire is used in the coaxial cable inner conductor not only has a very high signal transmission characteristics, has now become the most used wire in cable television and other high frequency applications, but also the coaxial cable inner conductor and electrical equipment wire The preferred material for the cable.