The bicycle is not only a tool instead of walking green, is the symbol of sports health fashion, riding a bicycle has become the ages of recreational sport. Bicycle has been pushed to light weight, need to have beautiful, strong, novel, portable, cheap features; aluminum alloy due to the low density, high strength, forming a good, good welding, surface treatment, color is gorgeous and not vulgar, and other advantages become the first choice for the bike. The company has developed a bike strength and surface requirements of the aluminum alloy material: H601, 6061, 7005, 7050, etc..