Abstract: Recently, spray-anchor-net is extensively applied in deep exaction of many buildings at Wuhan city as a new support method,At the same time, a lot of the research is about the practical application and the qualitative analysis as a active restraining mechanism, but the less of research is about the structural deformation which is influenced by the groundwater seepage affection, so it has become the decisive problem restraining the next application.In this paper, spray-anchor-net support structure is abstracted scientifically and reasonably,and the mathematical model is established about the couple of the seepage and the stress, the finite element calculation program taking account into the underground water permeability is compiled,the result is indicated by the practical case that the finite element method (FEM)is the valid method analyzing the spray-anchor-net deformation which is affected by seepage, and the deformation can be predicted more accurately, the ameliorative suggestion is given for the design and the informational construction of the deep foundations.