建立了以基坑支挡结构计算分析中的“ｍ”法为基础的位移反分析模型，给出了一种优化算法并讨论了解的收敛性和计算时间等问题，最后给出了位移反分析技术在基坑工程中的应用实例，说明所建立的模型及其算法是合理可行的。 The displacement back analysis model based on the “m” method in the computation analysis of the foundation pit retaining structure is established. An optimization algorithm is given and the convergence and calculation time of the understanding are discussed. Finally, the back analysis of displacement is given. The application example of technology in the foundation pit engineering shows that the model and its algorithm are reasonable and feasible.