文章从分析基坑位移影响因素和位移特征入手 ,提出了根据现场位移观测值建立灰色预测预警模型的思路 ,并讨论了建模过程。实践证明基坑变形灰色预测系统有较好的精度 ,对指导基坑开挖和支护有积极意义 Starting with the analysis of influencing factors and displacement characteristics of foundation pit displacement, the article put forward the idea of ​​establishing gray forecasting and warning model based on the observed data of site displacement and discussed the modeling process. It has been proved by practice that the deformation forecasting system of foundation pit has better precision and has positive significance to guide excavation and support of foundation pit