Ensuring　formation　stability　is　vital　to　realizing　the　commercial　development　of　hydrate　reservoirs.　Therefore,　studying　the　formation　subsidence　in　the　hydrate　mining　process　is　essential.　This　study　proposes　a　method　for　predicting　the　maximum　surface　subsidence　using　the　hydrate　dissociation　front.　Firstly,　to　more　realistically　evaluate　the　hydrate　dissociation　characteristics　and　reservoir　deformation　during　the　hydrate　mining　process　in　permafrost,　soil　permeability　experiments　under　different　hydrate　saturations　were　conducted,　and　the　dynamic　permeability　model　was　established.　On　this　basis,　combined　with　the　multifield　coupling　model,　the　depressurization　process　of　the　hydrate　reservoir　is　simulated.　The　hydrate　dissociation　property　and　stratum　subsidence　response　under　different　parameters　are　analyzed.　In　addition,　the　parameter　sensitivity　is　evaluated,　and　the　corresponding　relationship　between　the　hydrate　dissociation　front　and　the　maximum　surface　subsidence　is　established.　According　to　the　research　results,　assuming　that　the　safety　limit　of　surface　subsidence　is　set　to　0.3　m,　the　safe　hydrate　dissociation　range　within　soil　permeability　K　=　[20　mD,　120　mD]　is　about　[0　m,　77.7　m].　For　every　20%　decrease　in　wellhead　pressure,　the　hydrate　dissociation　range　increases　by　30%.　It　is　worth　noting　that　the　three　points　A,　B,　and　C　(located　at　the　upper,　middle,　and　lower　positions　next　to　the　well　perforation　end)　show　completely　different　deformation　trends　during　the　mining　process.