The　excavation　of　foundation　deformation　can　result　with　spatial　effect.　The　paper　makes　a　numerical　analysis　on　the　deep　foundation　for　Wanda　square　project　by　using　software　Midas.　The　numerical　analysis　results　are　verified　by　the　data　from　the　project.　Based　on　analysis　on　the　deformations,　the　laws　of　the　spatial　effect　on　the　supporting　structure　and　the　surrounding　soil　are　summarized,　showing　that　the　spatial　effect　can　be　found　in　most　foundation　projects,　but　the　spatial　effect　is　not　obvious　when　the　depth　of　the　foundation　is　small　or　the　excavation　is　not　started.　The　factors　including　the　depth　of　the　foundation　and　the　type　of　supporting　makes　clear　effects　on　the　spatial　effect　of　the　foundation.　Foundation　pit　retaining　wall　deformation　has　some　relationship　with　flexural　rigidity　and　the　depth　of　excavation,　increase　the　excavation　depth　or　reduce　the　structure　stiffness　can　lead　retaining　wall　to　the　maximum　deformation　position　move　downwards,　until　the　pit　bottom.　Surface　settlement　around　foundation　pit　excavation　unloading　is　within　the　scope　of　influence　of　each　layer　of　soil　deformation　cumulative　formation,　with　the　increase　of　soil　depth,　the　settlement　deformation　of　soil　gradually　decrease.　©　2015　ejge.