Finite element calculation analysis has been widely used in foundation pit engineering but the value of elastic modulus is difficult to determine .Through the existing elastic modulus model ,combining with Tianjin's regional geological feature and the characteristics of foundation pit engineering's excavation and unloading ,the author uses finite element software to conduct a finite element analysis of foundation pit excavation of a deep foundation pit in Tianjin .The deformation value offered by calculation is compared with the monitoring deformation value ,which matches very w ell and gets a good effect .%指出了有限元计算分析在基坑工程中的运用已经较为普遍，但其弹性模量的取值却比较困难。通过已建弹性模量模型，结合天津地区的区域地质特征及基坑工程开挖缷荷的特点，利用有限元软件，对天津某深基坑进行了基坑开挖有限元计算分析，计算所得变形值与监测变形值进行了比对，吻合程度很好，取得了较好的效果。
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