The extensive emission of carbon dioxide，leading to global warming，has attracted widespread attention. Excessive energy consumption for regeneration has become the main reason limiting the application of carbon capture systems(CCS)on ships. In this study，tailored to the specific needs of marine diesel engine，a novel two-phase absorption system，3-methylaminopropylamine-sulfolane-water(MAPA-SFL-H2O) was constructed. Experiments were conducted using simulated ship exhaust with a gas flow rate of 1000mL/min. The absorption，desorption，and cycling performance of the two-phase absorbent were investigated under various conditions，including different absorbent composition ratios，absorption temperatures(30—60℃)，CO2 volume fraction(3%—5%)，and impurity gases(SO2 and NO)，using a bubbling device and titration setup. The results indicate that the absorption rate of the MAPA-SFL-H2O two-phase absorbent under the different CO2 volume fraction conditions of ship exhaust is higher than that of monoethanolamine(MEA). When the mass ratio of the absorbents is 3︰3︰4，the system exhibited its optimal performance. Compared to MEA of equal mass，the cyclic load increased by 72.3%，while the energy consumption for regeneration is reduced by 28.4 %. Carbon-13 nuclear magnetic resonance(13CNMR) detection result shows that the primary amine group in MAPA is the main CO2 carrier，and the secondary amine group is involved in proton transfer. The phase change of the absorbent is influenced by the CO2 load. An increase in load promotes the precipitation of SFL to form a lean phase，which facilitates two-phase separation and significantly reduces the energy consumption for regeneration.