Abstract: The control of groundwater and reduction of its negative influences upon foundation pits and surrounding environment are very important subjects in deep excavation projects.A series of 3D finite element analyses of the seepage fields in foundation pits were conducted.In this way,the simulation of actual seepage fields in complicated site and construction conditions was made in order to have a deep view of the general rules of seepages in foundation pits.Thus,the deficiency in understanding of the behavior of waterproof walls might be diminished,and more feasible and economic measures could be adopted for the design and construction of foundation pits.