Abstract: ABAQUS sottware is used to establish the model ot excavation of soft soft foundation pit approaching building in Huining Jiayuan residential quarte,Tianjin.The maximum inclination of building is taken as the criterion to analyze the features of influence of each element in the support structure system on the deformation of the adjacent building.Several conclusions were drawn:①Increasing the distance between the building and the foundation pit can effectively control the settlement and inclination of the building.②Increasing the height of the inner support or the prestress of the internal support can effectively control the settlement and deformation of the adjacent building.③The concrete strength,the diameter and length of pile have little influence on the settlement and inclination of building.④Increasing the cohesion and angle of internal friction of the soil can effectively control the settlement and inclination of the building,which can be used as an option for the protection of building under certain circumstances.