Carried on the introduction and the analysis of several kinds of CO2 capture technologies at home and abroad.According to the characteristics of the flue gas of coal-fired power plant,the selection conditions of CO2 capture technologies used in flue gas were proposed.Hydramine method that is fit for flue gas of coal-fired power plant is commended.On the base of it,give the material suggest in the selection of the absorbent of multi-hydramine and selecting the technics.