In　this　paper,　a　numerical　method　of　the　rising　groundwater　level　is　presented　through　an　elastoplastic　constitutive　model　for　the　unsaturated　soil　and　a　numerical　realization　method　for　the　rising　groundwater　level.　A　model　test　of　the　rising　groundwater　level　is　conducted　to　validate　the　rationality　of　the　presented　numerical　method.　Taking　an　interval　subway　tunnel　in　Beijing　as　the　background,　a　numerical　simulation　with　a　homogeneous　soil　layer,　which　contians　the　existing　tunnel,　is　conducted　according　to　the　presented　numerical　method　of　the　rising　groundwater　level.　Based　on　the　numerical　simulation　results,　the　variations　of　the　ground　saturation,　the　ground　stress　state,　and　the　ground　vertical　deformation　under　the　condition　of　the　rising　groundwater　level　are　studied　through　a　homogeneous　soil　layer,　and　the　normal　contact　pressure　on　the　outer　surface　of　the　lining,　the　radial　deformation,　the　bending　moment,　the　hoop　thrust,　and　the　shear　force　of　the　lining　under　the　condition　of　the　rising　groundwater　level　are　analyzed　through　a　homogeneous　soil　layer　with　the　existing　tunnel.