The traditional carbon dioxide purification technology from stack gas mainly uses chemical method(MEA process), but it has disadvantages of high running cost, environmental pollution, serious equipment corrosion, a large amount of maintenance, etc.. PSA carbon dioxide purification technology from stack gas developed by Tianli completely overcomes all of disadvantages of chemical method(MEA process), that is to say, Tianli technology have advantages of low running cost, no environment pollution and equipment corrosion, a small amount of equipment maintenance, etc..