Carbon dioxide removal was carried out for LNG-fired power station flue gas, using a pilot-scale absorber of about 25 m in height at an exhaust gas flow rate of 555 m(3)/h. The relationship between amine loss discharged from a CO2 recovery system and the operating conditions and configuration of the washing water line equipped with an absorber unit were examined. The test result showed that outlet alkali (amine) concentration in the gas phase decreases with decreasing absorber outlet temperature. The alkali concentration was confirmed to decrease with a decrease in the alkali concentration in washing water. An improvement of washing water line by dividing it into two steps was found to be remarkably effective to decrease outlet alkali concentration. In the case of KS-1 solution, which is composed of sterically hindered an-line and alkanolamine, excellent results were obtained by such a strategy to reduce amine loss: outlet alkali concentration ranged from 2.3 ppm to 10.4 ppm, and average amine loss amounted to 0.11 g-amine/kgCO(2). This degree of amine loss is as low as 1/20 th of that of the conventional process. Both a low impact on the environment and a reasonable cost reduction can be attained by adopting a two-step washing water line.