Aiming at the problem of stability and safety of deep foundation pit after water and soil bursting,we adopt the finite element software ANSYS to analyze the excavation of foundation pit,and calculate the stress and deformation under different working conditions.Based on the comparison of calculation and monitoring data,we evaluate the safety of foundation pit,and put forward solutions.The results indicate that water bursting has little influence on the compresol pile of the foundation pit.However,the deformation of soil and girder change greatly.By the solution measures,the safety performance of foundation pit still is guaranteed.