Groundwater　can　cause　many　hazardous　problems　when　a　tunnel　is　excavating.　Seepage　force　acting　on　the　support　structure　and　the　tunnel　surface　cannot　be　negligible.　Under　high　groundwater　table　condition,　the　seepage　situation　becomes　more　complex　and　it　is　more　difficult　to　control　the　leakage　of　groundwater　to　flow　into　a　tunnel.　In　the　paper,　a　multiple　times　grouting　method　is　proposed,　and　the　mechanical　deformation　behavior　of　surrounding　rock　is　analyzed　using　the　FLAC3D　(Fast　Lagrangian　Analysis　of　Continua　in　3　Dimensions)　software　according　to　the　high　groundwater　table　condition　of　the　Hokusatsu　tunnel.　The　results　present　that　multiple　times　grouting　can　control　leakage　and　the　rock　deformation　well,　compared　with　one-time　grouting　condition　in　rock　breaking　and　high　water　pressure　area.　The　seepage　force　decrease　around　the　tunnel　and　the　displacement　is　controlled　effectively.　The　pore　pressure　reduces　inside　the　grouting　zone　using　a　new　kind　of　grouting　material,　which　is　high　permeability　ultramicro　particle　cement　(average　particle　size　1.5　m).　In　the　test　fieldwork,　the　grouting　scheme　reduces　the　maximum　discharge　from　300　t/h　to　40　t/h,　and　there　is　not　obvious　deformation　and　abnormal　stress　in　the　tunnel.　The　multiple　times　grouting　method　proposed　in　this　research　is　verified　effectively　and　can　supply　a　positive　experience　to　on-site　construction.