Aluminium Alloy featured with lightweight, good processing performance and corrosion resistance, which is the best choice of the automotive industry. The density of Aluminium alloy is 2.68 g/cm3 only, which is 30% of steel. Within the same flexural rigidity, weight reduction is 38% compared with steel. Statics data shows a portion of weight reduction replace steel or copper parts with Aluminium alloy will be 30%~40% in automotive chassis system, body and heat exchange system. The current application of Aluminium extrusion products in China s transportation sector accounts for 27% only of the total demand for industrial Aluminium extrusion products. Which is much less than 47% in the USA, 45% in Europe, 50% in Japan. Under the trend of energy conservation and emission reduction, the development of new energy automobiles and improvement of motor performance, the future is lightweight.