The effects of various system parameters on the absorption and desorption of carbon dioxide into the absorbent liquid were investigated in a circulatory hollow fiber membrane contactor with absorption and vacuum mode desorption modules. An aqueous potassium carbonate solution was used as a chemical absorbent and its permeation results were compared to those obtained with pure water as a physical absorption in order to figure out the effect of chemical reaction. The mixture of caron dioxide and nitrogen was used as an feed gas, and the pore condition of hollow fiber membrane was hold to be non-wetted through an appropriate control of pressures of the mixture gas and the absorbent. The permeation rate of carbon dioxide was increased with the increment of the flow rate of the absorbent in the absorption module. Particularly, in the case of an aqueous potassium carbonate solution used as an absorbent, the permeation rate of carbon dioxide was higher than that in pure water. The permeation rate was increased with the increments of the flow rate of mixture gas. The desorption rate of carbon dioxide was increased with the increment of the vacuum degree in the desorption module, and the absorbent flow rate for the desorption module.