Abstract:High speed milling programming in MasterCAM X7 improves the programming method of mechanical parts CNC machining,machining quality and efficiency greatly.Through the use of this programming method,effective and precise mechanical parts processing could be achieved,while cutting tools and machine wear could be reduced.In 3D machining programming,the processing effect that many steps programming could achieve in the past was achieved.Flexible application of different processing strategies made complex surface machining and tool path generation more reliable and efficient,the machining quality was improved significantly.