Rising　sea　level　caused　by　global　climate　change　may　increase　extreme　sea　level　events,　flood　low-lying　coastal　areas,　change　the　ecological　and　hydrological　environment　of　coastal　areas,　and　bring　severe　challenges　to　the　survival　and　development　of　coastal　cities.　Hong　Kong　is　a　typical　economically　and　socially　developed　coastal　area.　However,　in　such　an　important　coastal　city,　the　mechanisms　of　local　sea-level　dynamics　and　their　relationship　with　climate　teleconnections　are　not　well　explained.　In　this　paper,　Hong　Kong　tide　gauge　data　spanning　68　years　was　documented　to　study　the　historical　sea-level　dynamics.　Through　the　analysis　framework　based　on　Wavelet　Transform　and　Hilbert　Huang　Transform,　non-stationary　and　multi-scale　features　in　sea-level　dynamics　in　Hong　Kong　are　revealed.　The　results　show　that　the　relative　sea　level　(RSL)　in　Hong　Kong　has　experienced　roughly　2.5　cycles　of　high-to-low　sea-level　transition　in　the　past　half-century.　The　periodic　amplitude　variation　of　tides　is　related　to　Pacific　Decadal　Oscillation　(PDO)　and　El　Niño-Southern　Oscillation　(ENSO).　RSL　rise　and　fall　in　eastern　Hong　Kong　often　occur　in　La　Niña　and　El　Niño　years,　respectively.　The　response　of　RSL　to　the　PDO　and　ENSO　displays　a　time　lag　and　spatial　heterogeneity　in　Hong　Kong.　Hong　Kong＇s　eastern　coastal　waters　are　more　strongly　affected　by　the　Pacific　climate　and　current　systems　than　the　west.　This　study　dissects　the　non-stationary　and　multi-scale　characteristics　of　relative　sea-level　change　and　helps　to　better　understand　the　response　of　RSL　to　the　global　climate　system.　Copyright　©　2023　Liang,　Lin,　Wu,　Li,　Khan,　Liu,　Su,　Wei　and　Zhang.