Global　sea　level　rise　is　a　major　environmental　concern　for　many　countries　and　cities,　particularly　for　low-lying　coastal　areas　where　urban　development　is　threatened　by　the　combined　effects　of　sea　level　rise　and　land　subsidence.　This　study　employed　an　improved　two-layer　network　Persistent　Scatterers　Interferometric　Synthetic　Aperture　Radar　(PS-InSAR)　technology　to　obtain　high-precision　land　subsidence　in　Singapore　from　2015　to　2019.　Landsat　images　from　1973　to　2020　were　also　utilized　to　extract　changes　in　Singapore’s　coastline.　Geological,　topographical,　and　global　sea　level　rise　data　were　integrated　to　investigate　the　causes　and　impacts　of　land　subsidence　in　Singapore.　The　results　indicate　that　the　areas　with　severe　subsidence　coincide　with　land　reclamation　areas,　where　subsidence　is　mainly　due　to　soil　consolidation.　Based　on　WorldDEM,　land　subsidence,　and　sea　level　rise　data,　the　maximum　inundation　depth　in　Singapore　by　2050　is　estimated　to　be　1.24　m,　with　the　Marina　Bay　area　in　Singapore’s　central　business　district　being　the　most　vulnerable　to　sea　level　rise.　This　study　provides　data　support　and　a　scientific　basis　for　understanding　the　impact　of　land　subsidence　on　Singapore’s　coastal　areas　under　the　influence　of　multiple　factors　using　advanced　InSAR　technology.　©　2023　by　the　authors.