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Special reaction systems were proposed to investigate the mechanism of the mass transfer process in the membrane absorption process. The mass transfer resistance of this process was calculated by using hydrophobic polypropylene (PP) hollow fiber membrane (HFM); and a 2-order partial differential model, including reaction, was developed to describe the SO 2 and CO 2 absorption process using HFM. Throughout the experimental analyzing and model results, for either SO 2 /air/NaOH system or CO 2 /air-NaOH system, different phenomena in these two systems were discussed. Since the reaction mechanisms of both the SO 2 -NaOH system and the CO 2 -NaOH system were different, the SO 2 and CO 2 mass transfer in liquid side were different. The relation between the chemical reaction mechanism and mass transfer, instead of the ionized effect, was the reason for deviation in SO 2 absorption process. The influence of liquid phase velocity and the concentration of absorbent on the mass transfer process was also discussed. [ABSTRACT FROM AUTHOR]