参数反演是施工过程安全性分析的一个重要研究内容，而位移对参数的灵敏度计算是其关键。线性模型灵敏度分析早已有了成熟的研究，与线性模型相比，弹塑性模型参数的位移敏度分析却一直未得到很好解决。本文以能较好模拟土壤弹塑性力学行为的ＤｒｕｃｋｅｒＰｒａｇｅｒ准则为例，通过引入应力空间下的自然坐标系，将应力球量与应力偏量进行分解，从而导出一个有限元计算中位移对参数灵敏度的闭合形式公式。 Inversion of parameters is an important research content in the safety analysis of construction process, and displacement is the key factor in the sensitivity calculation. Linear model sensitivity analysis has long been a mature study, compared with the linear model, the elastic-plastic model parameters of the displacement sensitivity analysis has not been well resolved. In this paper, Drucker-Prager criterion, which simulates soil elasto-plastic behavior, is taken as an example. By introducing a natural coordinate system under stress space, stress mass and stress deviations are decomposed to derive a displacement-to- Sensitivity closed form formula.