Pilot plant tests of the CO2 chemical absorption process (capacity: 1000m3N/h) were carried out under various operation conditions. In the tests, a newly developed absorption solution was used. Test results were evaluated by using the overall mass transfer coefficient KOGa of the absorption process. The collected data were applied to the evaluation program which calculates plant equipment specifications and design configurations. After the computer aided study the CO2 absorption plant for 1000MW thermal power plant was designed in which CO2 removal is 90%. The construction area for of the CO2 absorption plant for the 1000MW power plant will be about 170m X 110m.