Abstract: Mass-transfer performance of two packing structures was investigated with the CO2-NaOH system. The results showed that the volumetric mass-transfer coefficient of cross-flow rotating bed with protruded ripple plate packing was 0.95～2.1 higher times than that in the cross-flow rotating bed with wire –gauze packing，and was slightly less than the countercurrent rotating bed and was 1～2 orders of magnitude higher than the conventional gas-liquid mass-transfer equipments under the same operational condition，respectively. Through the experimental date，correlative expression of the volumetric mass-transfer coefficient was obtained with MATLAB program.