本文以二维有限元正分析为基础，运用非线性规划中的单纯形法进行软土地区深基坑开挖的反分析，并对上海某深坑开挖问题进行了实际的反分析，实例说明反分析法可以应用在实际工程分析中。 Based on the two-dimensional finite element positive analysis, this paper uses the simplex method in nonlinear programming to carry out back analysis of deep foundation pit excavation in soft soil area, and carries out an actual back analysis of a deep pit excavation problem in Shanghai. It shows that the back analysis method can be applied in practical engineering analysis.