本文借助Ｌａｇｒａｎｇｅ（Ｔ．Ｌ．）法、修正的Ｌａｇｒａｎｇｅ（Ｕ，Ｌ，）法及带有动坐标的迭代法求解梁的几何非线性问题，说明了各自的特点，澄清了若干基本概念。指出动坐标方法实质上就是Ｕ．Ｌ．法，它适合于分析具有大转动梁的问题，并可方便地推广到大转动的板壳问题。同时指出对于几何非线性问题，可以不必区分Ｃａｕｃｈｙ应力和Ｋｉｒｃｈｈｏｆｆ应力。 In this paper, the geometric nonlinear problems of beams are solved by the Lagrange (T.L.) method, the modified Lagrange(U,L,) method, and the iterative method with moving coordinates. The characteristics of the beams are illustrated and some basic concepts are clarified. It is pointed out that the dynamic coordinate method is essentially U. L. The method, which is suitable for analyzing problems with large rotating beams, can be easily extended to large rotating plate shell problems. At the same time, it is pointed out that for geometric nonlinear problems, it is not necessary to distinguish between Cauchy stress and Kirchhoff stress.