High precision CNC machining aluminium parts is used widely in the field of aviation, automobile, mechanical manufacturing, ship, chemical, domestic appliance and daily necessities. With the rapid development of science and technology and industrial production, the demand of high precision CNC machining aluminium parts is increasing day by day. AL6061 is common type of aluminium, and it is often used for the parts of automobile, the frame of bicycle, sports equipment and frame of toy car. Similar with other aluminium alloy, AL6061 has good strength-weight ratio and atmospheric corrosion resistance.