This paper introduces the fast calculating method in accor-dance with least condition linearity error with FGF judging method. The method is Yery easy to complete with computer, simple and clear.

• 介绍一种按FGF判断法求符合最小条件直线度误差的快速算法，该算法很容易在计算机上实现，具有简单、明了的特点。