The performance of computerized numerical control(CNC)machine tool is evaluated by the traditional positioning error and the positioning repeatability,which is in quasi static and cannot reflect the precision of machine tool in the process of movement and machining. In this paper,a novel precision evaluation method which takes the dynamic precision as index is proposed for high-speed machine tool. The precision of machine tool is described through the consistence of the actual trajectory and the ideal command. The specific evaluation index of dynamic precision is provided. Meanwhile,the measure method of evaluation index is put forward. It can be obtained that this new evaluation method of machine tool precision can evaluate the quality of key performance in CNC machine tool systematically and roundly.% 传统的定位精度与重复定位精度等指标是在准静态下评价数控机床(CNC)性能的，无法反映数控机床在运动和加工过程中的精度。首先从数控机床的数控、伺服、机械等环节在服役态下所表现出来的性能出发，提出一种对数控机床更有针对性的，以运动精度为指标的机床精度评价新方法，通过数控指令与运动轴实际位移的符合程度即运动精度来评价机床精度，然后给出了具体的评价指标，并提出了评价指标的测量方法。分析表明，这种新的机床运动精度描述评价方法能够系统、全面地评价数控机床关键性能的优劣。最后从数控、伺服和机械角度分别阐述了影响运动精度的因素。
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