A　thermal-hydrologic-mechanical　(THM)　coupling　model　during　the　carbon　dioxide　plume　geothermal　system　(CPGS)　heat　exploitation　process　was　established.　An　ideal　geothermal　reservoir　geothermal　exploitation　process　was　studied　numerically,　which　combined　with　five-spot　well　pattern　and　a　three-dimensional　multi-rock　formation　geometric　model.　The　rock　deformation　performance　of　CPGS　geothermal　exploitation　process　and　the　influence　of　rock　deformation　and　geothermal　reservoir　initial　porosity　to　CPGS　heat　exploitation　were　studied.　The　results　showed　that　the　rock　significantly　shrinkages　during　the　process　of　the　CPGS　operation,　reduces　the　volume,　and　increases　the　porosity　of　the　reservoir.　The　deformation　also　helps　increasing　the　permeability　of　thermal　reservoir,　accelerating　the　rate　of　exploitation　process,　and　thus　enhancing　the　geothermal　exploitation　process.　While　the　porosity　was　lower,　the　influence　of　rock　deformation　was　more　obvious.　Under　the　consumption　that　the　initial　permeability　is　the　same,　the　smaller　the　initial　porosity,　the　greater　the　increase　in　permeability　caused　by　rock　deformation,　and　the　faster　the　thermal　recovery　rate　of　the　system.　©　All　Right　Reserved.