The simulation of pressure swing adsorption(PSA) process for recovering highly pure CO₂ from flue gas was performed. Seven different processes including blowdown, pressure equalization, rinse and/or evacuation step were compared to obtain optimal process. In this study, bed dynamics was considered for the better simulation result. Activated carbon was used as an adsorbent. Pressure equalization contributed to increase the recovery and purity by preventing CO₂ loss at blowdown and redistributing the components in the bed. And also, rinse, recycling the product gas recovered at evacuation step, conduced to increase the purity by readsorbing highly concentrated CO₂. Especially, pressure equalization step combined with rinse step plays a key role in improving the performance of process because of minimizing the concentration of N₂ in bed and increasing pressure difference between the bed pressure and atmospheric pressure. Maximum purity was about 97% and recovery at that point was about 55%.