The　efficient　capture　of　CO2　has　always　been　a　goal　pursued　by　people.　However,　low　gas　handling　capacity　and　low　gas-liquid　ratio　restricts　existing　gas-liquid　contactors,　especially　for　non-rotating　ones.　In　this　study,　a　gas-liquid　contactor　with　high　gas　handling　capacity　and　high　gas-liquid　ratio,　the　rotating　spiral　contactor,　was　developed.　Hydrodynamic　properties　of　the　contactor　were　experimentally　or　theoretically　investigated.　A　novel　interface　model　was　developed　to　describe　gas-liquid　interface　shape.　CO2　capture　using　MEA/DMEA　aqueous　solution　were　evaluated　in　terms　of　space-time　yield　(tau),　overall　volumetric　mass　transfer　coefficient　(KGae)　and　CO2　capture　efficiency　(eta).　A　rate　-based　model　was　developed　and　applied　for　the　first　time　to　predict　CO2　capture　in　the　rotating　spiral　contactor.　The　hydrodynamic　results　showed　that　liquid　layer　thickness　was　below　400　mu　m　for　the　liquid　with　viscosity　of　14.5　mPa.s.　Under　the　rotational　speed　of　1200　rpm,　the　gas-liquid　ratio　ranged　from　525　to　2700,　while　the　gas-liquid　surface　area　remained　around　667　m2/m3.　The　interface　model　predicted　interface　thickness　within　a　relative　deviation　of　+/-　20　%.　The　results　also　showed　that　tau,　KGae　and　eta　respectively　were　3428-17021　h-1,　1.0-6.4　kmol.m-　3.h-1.kPa-　1　and　38-98　%　at　the　gas-liquid　ratio　range　of　200-1000.　The　predicted　KGae　and　eta　by　rate　-based　model　agreed　well　with　the　experimental　data　within　a　relative　deviation　of　+/-　15　%.　This　rotating　spiral　contactor　is　ideally　suitable　for　the　scenarios　with　large　gas　handling　requirement　and　high　gas-liquid　ratio.