The application of laser has become more and more mature after several decades of development, which has brought great changes to the global manufacturing industry, especially the sheet metal processing industry. Fiber laser cutting machine has come into our life from the industrial field, and its suitable for cutting more and more materials. But in the use of fiber laser cutting machine cutting different materials, the cutting methods used also need to make appropriate adjustments to achieve the ideal cutting quality one, stainless steel cutting stainless steel metal plate generally used nitrogen, prevent oxidation, no burr edge, almost no post-processing can be directly welded, according to the characteristics of stainless steel materials can speed up the flow of liquid, cutting efficiency is higher and faster. And the use of oxygen cutting effect may be worse than nitrogen, resulting in end face blackening, not smooth and so on. Second, carbon steel cutting laser cutting carbon steel when the general use of oxygen will get better results. While the cutting efficiency is greatly improved by using the oxygen reaction heat, the resulting oxide film can also increase the absorption factor of the reflecting material. When using oxygen processing, there is a problem that the edge may be slightly oxidized, if more stringent users can use nitrogen for high-pressure cutting, of course, you can also oil the surface of the workpiece to achieve a better cutting effect. Aluminum cutting aluminum is a high reflective material in metal materials, it has high reflectivity and thermal conductivity. In recent years, many laser cutting machines are equipped with anti-reflective devices to adapt to aluminum cutting, and the optical components are damaged by using laser cutting machines without anti-reflective devices. At the same time, according to the power of different equipment, cutting aluminum thickness is also different. Generally speaking, the same equipment cutting stainless steel and carbon steel thickness than aluminum equal height anti-material thickness to be thick. Aluminum is also more suitable for nitrogen cutting, cutting effect is good end more smooth. Copper and brass cutting and aluminum, copper and brass are high reflective material, need to use anti-reflective device of laser cutting machine. Brass less than 1mm thick can be cut with nitrogen; copper less than 2mm thick can be cut.