Abstract: Taking a deep foundation pit engineering of a research building in Tianjin as an example,analysis adjacent pipeline displacement rule caused by foundation pit excavation with the finite element simulation.Simulation results show that different excavation sequence will lead to different displacements of pipeline,the influence on pipeline from middle to both sides excavation is smaller than that from both sides to the middle excavation,and at the end of the foundation pit is the maximize curvature change of the pipeline.The soil reinforcement can effectively reduce the displacement of pipeline caused by foundation pit excavation.Different depth and width of reinforced soil will result in different restrictions on pipeline displacement function.In combination with the practical situation of the project,believe that when the strengthening depth is 7 m and the width is 7 m is the most economic under the premise of best reinforcement effect.