An ionic liquid-based composite solution,[Bmin] [BF₄]+AMP was used to capture CO₂.Performance of the composite solution was studied in a circular system of membrane absorption-heat regeneration.A mass transfer model was developed to predict overall mass transfer coefficient.Results show that the composite solution has higher mass transfer driving force and higher mass transfer coefficient under the same conditions with higher loading.Prediction values are in good agreement with experimental values,with average error of 12.8%.It is demonstrated that the performanceof the composite solution for CO₂ captureis superior to that of single solution.