The cutting efficiency of CNC machining is affected by human factors, environmental factors and machine factors. Below we talk about the amount of cutting and the influence of the tool on the CNC machining. Reasonable cutting amount can improve the efficiency of CNC numerical control lathe. When the cutting speed is increased by 10 times and the feed rate is increased by 20 times, far beyond the traditional cutting exclusion zone, the cutting mechanism has undergone a fundamental change. As a result, the metal removal rate per unit power is increased by 30{40853765ee30ac98edfcc6f3daa6ce342bfa067bc7a6d6f9827ef46304b1ff49} to 40{40853765ee30ac98edfcc6f3daa6ce342bfa067bc7a6d6f9827ef46304b1ff49}, the cutting force is reduced by 30{40853765ee30ac98edfcc6f3daa6ce342bfa067bc7a6d6f9827ef46304b1ff49}, the cutting life of the tool is increased by 70{40853765ee30ac98edfcc6f3daa6ce342bfa067bc7a6d6f9827ef46304b1ff49}, the cutting heat remaining on the workpiece is greatly reduced, and the cutting vibration is almost eliminated. The cutting process has undergone an essential leap. According to the current situation of CNC machining, increase the feed per tooth, improve productivity and tool life. The role of the tool on the CNC machining is like the effect of the wheel on the car. The material used to make the tool must have high high temperature hardness and wear resistance, necessary bending strength, impact toughness and chemical inertness, good processability (cutting, forging and heat treatment, etc.) and not easily deformed. Good tools can increase the efficiency of machining and the accuracy of the workpiece being cut. The remaining factors such as power supply, familiar operation, and reasonable materials will affect the processing of CNC machining.