Also the error of the premise of the magnified method based on the geometric progression of additional deformations is studied.It is recommended that the two methods should be combined together.

• 文中分析了基于附加变形的等比级数假定的放大系数二阶分析法的误差来源和特点，分析同时表明，两个方法的结合是自然而有效的。