机床加工误差补偿是提高加工精度的重要途径.正确测量机床主轴误差运动是实现加工误差补偿的前提.然而,这一测试问题一直未得到很好解决.本文提出的用差动传感器直接相对主轴表面测量的系统比较简单,容易实现,且为实时测量.该方法已用于车削加工误差实时补偿系统之中,取得了较好的效果. Machine tool error compensation is to improve the processing accuracy of an important way to correctly measure the spindle error movement is to achieve the premise of processing error compensation.However, this test has not been a good solution to this paper proposed differential sensor directly with the spindle surface The measurement system is relatively simple, easy to implement, and real-time measurement.The method has been used in the real-time compensation system of turning machining error, and achieved good results.