论述了圆度误差分离的三点法及演化形式——二点法和四点法的基本原理 ,通过分析它们各自的特点和测量精度指出权函数的取值是影响测量精度的关键因素 ,应通过合理选择测量系统参数以避免谐波抑制的发生 ,而且应针对具体情况选择适当的圆度误差分离方法 The basic principle of the three-point method and the evolution form of circularity error separation - the two-point method and the four-point method are discussed. It is pointed out that the value of the weight function is the key factor affecting the measurement accuracy by analyzing their respective characteristics and measurement accuracy. By reasonably choosing the measurement system parameters to avoid the occurrence of harmonic suppression, the method of circularity error separation should be chosen according to the specific situation