This research was basically carried out to extend the application of CO2 absorption processes for flue-gas system, which are mainly applied to a reforming process in petro-chemical industries. In general, MEA absorbent has some problems in flue-gas treatment, such as, degradation, regeneration energy and absorption capacities. As we known, sterical hindered amine, typically AMP (2-amino 2-methyl 1-propanol), have a good potential to improve these problems. In this paper, the characteristics of CO2 absorption in aqueous AMP solution were measured and compared with that of MEA. It has been found that the CO2 absorption capacity in AMP is double than that of MEA in the low CO2 partial pressure system such as flue-gas. Also, the equilibriums of CO2-AMP system were partially suggested, which are essentially needed to design the absorption process.