Flame cutting is cutting deformation, can not adapt to the needs of high-precision cutting and low cutting speeds, cutting required before preheating, spend time, no one can hardly meet the needs of the operation. Plasma Cutting a wide range of cutting, cut all the sheet metal and many non-metallic materials, the maximum cutting speed up to 10 m / min, flame cutting 10 times. Cutting can be underwater when the elimination of noise, dust and harmful gases and arc is conducive to the protection of the environment, in line with the 21st century on environmental protection requirements. With the current high-power plasma cutting technology matures, cutting thickness has reached 130 mm, using water jet technology, such as high-power plasma cutting has been cut nearly quality laser cutting threshold (＼ 0.2mm). The laser cutting machine is expensive, and are only suitable for cutting sheet (usually thick drilling a long time), and precision plasma cutting machine cutting precision laser cutting up the floor, cutting surface quality were similar, but much lower than the cost of laser cutting cutting, its about 1 / 3, the biggest cut up to 12 mm thickness, using precision plasma cutting machine to replace expensive laser cutting machine, is conducive to the most economic way to the larger amount, the implementation of high-speed precision cutting sheet . In addition, CNC plasma cutting materials and programming software automatically sets with material can improve the utilization rate of 5% ~ 10%, year-on-year cut of 20 million t, it can be saved in steel 100 ~ 2 million t, worth billions of dollars. Therefore, in the industrialized countries has emerged to CNC plasma cutting machine to replace flame cutting machines and laser cutting machine trend of development. Therefore, the promotion of research CNC plasma cutting technology is of great significance.