This paper models the least square algorithm of the cylindricity error in the rectangular coordinates,whose center may be set on random and all discrete data can be sampled optionally.

• 建立了采样数据为直角坐标值、坐标原点可以任意选取、各离散采样点之间也不要求为等角度间隔情况下,圆柱度误差评定的最小二乘数学模型。