针对磁流变抛光过程中的中频误差的控制，进行了驻留时间与中频误差影响关系的研究。对基于矩阵法得出的驻留时间进行分析，驻留时间矩阵沿抛光头的进给方向的起伏波动性，反映在抛光过程中速度的不连续性，会引入一定的中频误差。提出通过滤波算法使驻留时间沿抛光轮进给方向更加平滑，即相邻两点的速度更加接近，抛光轮只需要很小的加速度和很小的时间内即可完成整个加速过程，从而降低这种速度的波动性带来的误差。通过计算机仿真和实验验证，给驻留时间一个很小的扰动，会使残差的功率谱密度（PSD）曲线发散，而滤波后的驻留时间算法在“不失真”的情况下，在一定程度上抑制了中频误差。

For controlling mid-spatial error in the magnetorheological finishing，experiments were carried out to analyze the relationship between the dwell time and mid-spatial error. Based on the matrix method of dwell time algorithm，the fluctuation of the time matrix along the feed direction of polishing reflects the discontinuity of velocity，which will cause the mid-spatial error. This paper advanced to filter the dwell time and smooth the velocity，which can make the velocity of the adjacent points more close，so the polishing wheel only needs a small acceleration and very little time to complete the entire acceleration，so as to reduce the error caused by the fluctuation of speed. Through computer simulation and experiments，it verificated that to give the dwell time a small disturbance，the PSD curve will diverge， and the dwell time filtered will inhabit the mid-spatial error to some extent.