本文首先针对目前数控机床门类广、品种多的状况,从使用性能角度出发,对其进行分类,将数控机床划分为高、中、低三档。然后,以数控龙门镗铣加工中心为例,详细地阐述了数控机床的选型原则:注重实用性,选择恰当功能,避免追求过多功能;兼顾易操作性、易维护性,避免讲究性能高、精度高、自动化程度高,造成价格大幅度上升;注重数控系统的选择。最后,阐述了数控机床的一般选择步骤,给广大用户以指导。 In this paper, the current CNC machine tools wide range, variety of conditions, from the perspective of the use of performance, its classification, the CNC machine tool is divided into high, medium and low third gear. Then, taking CNC gantry boring and milling machining center as an example, the principle of selection of numerical control machine tools is expounded in detail: paying attention to practicability, selecting appropriate functions and avoiding pursuing too many functions; taking into consideration of easy operation, easy maintenance and avoiding paying attention to high performance , High precision, high degree of automation, resulting in a substantial increase in prices; focus on the choice of numerical control system. Finally, the general selection steps of CNC machine tools are expounded, guiding the users.