Abstract: Deformation as a control condition for supporting structure design in foundation pit is a very complex engineering problem, but fulcrum method is accepted by lots of engineers for its clear computing model and simple procedure. In fulcrum method calculation, the accuracy of the m-value effects the displacement and internal force results of supporting structure directly, so,this paper put the fulcrum method modeling inversion analysis used in actual project, in excavation process consides supporting deformation nonlinear. It develops FORTRAN program executing inversion calculating for supporting structure. getting m-value through inversion analysis and forecasting the deformation of supporting structure, realizing dynamic design and information construction.The results show that deformation inversion analysis obtains good results during parameter inversion and displacement prediction of deep foundation pit engineering, proving that the method is reasonable on inversion analysis and prediction during deep foundation pit excavation.