The　Gravity　Recovery　and　Climate　Experiment(GRACE)　gravity　satellites　can　only　detect　low-resolution　marinegravity　change.　This　study　proposes　to　use　satellite　altimetrydata　to　construct　high-resolution　marine　gravity　change　rate(MGCR)　model.　The　marine　gravity　field　change　is　mainlycaused　by　the　seawater　mass　migration.　Based　on　the　sphericalharmonic　function　(SHF)　method　and　mass　loading　theory,a　spherical　harmonic　synthesis　formula　is　constructed　to　cal-culate　MGCR.　This　idea　is　utilized　to　establish　MGCR　modelin　Arabian　Sea　(AS).　First,　the　multisatellite　altimeter　datafrom　1993　to　2019　are　grouped,　preprocessed,　and　utilized　toestablish　mean　sea-level　models;　then,　the　long-term　altime-try　sea-level　change　rate　(SLCR)　is　estimated.　Second,　thealtimetry　SLCR　subtracts　the　effects　of　Steric　and　GlacialIsostatic　Adjustment　(GIA)　to　obtain　the　SLCR　model　caused　bymass　migration　(AS_MM_SLCR).　Finally,　we　perform　sphericalharmonic　analysis　on　AS_MM_SLCR　and　apply　the　sphericalharmonic　synthesis　formula　to　estimate　MGCR　model　on　5　＇　x5　＇　grids　(AS_SHF_MGCR).　AS_SHF_MGCR　has　higher　resolutionthan　GRACE_MGCR,　compensating　for　inability　of　GRACE　todetect　small-scale　marine　gravity　changes;　the　MGCR　mean　ofAS_SHF_MGCR　is　0.13　mu　Gal/year,　which　indicates　the　long-termrising　trend　of　marine　gravity　in　AS.　This　letter　proposes　amethod　for　calculating　the　MGCR　using　satellite　altimetry,　whichoffers　a　novel　approach　for　marine　time-varying　gravity　research