On the effects of three methods above, we find that the importance index of IMM is less than or equal to that of EPM.And the importance index of EPM is less than or equal to that of EPOM.

• 二、关于三种减少交错边方法之成效分析方面：IM法顶点之重要度小于等于边路径法之重要度，且边路径法之重要度小于等于边路径位序法之重要度。