对上海机床厂生产的高精度万能外圆磨床砂轮架主轴系统进行了动特性分析，指出前后轴承增大供油压力和减小油腔深度，是提高该主轴动特性的好办法。 The dynamic characteristic analysis of the high precision universal cylindrical grinder spindle system produced by Shanghai Machine Tool Plant was carried out. It is pointed out that increasing the oil supply pressure and reducing the oil cavity depth before and after the bearing is a good way to improve the dynamic characteristics of the spindle.