Abstract: With the continuous global warming trend,reducing carbon emission from industry is imminent. In the production process of cement clinker,a large amount of tail gas in which consist over 30% CO_2 is emitted from the cement kiln. Therefore,it will contribute greatly to capture CO_2 from tail gas of cement kilns for carbon emission reduction of industrial field. Taking two ionic liquids,M_4GuAc( tetramethylguanidine acetate) and TMGLac( tetramethylguanidine lactate),as research objects,the absorption characteristics of pure CO_2 and CO_2 in simulated tail gas of cement kiln tail gas at 30 °C,50 °C and 70 °C were investigated. The results show that the maximum absorption capacity for pure CO_2 and CO_2 in simulated flue gas from cement kiln tail by ionic liquids decreases greatly with the increase of working temperature. The maximum absorption capacity of the two ionic liquids at 70 ℃ is 50% less than the maximum absorption capacity of the two ionic liquids at 30 ℃ . The absorption effect of M_4GuAc and TMGLacon CO_2 in simulated tail gas of cement kiln is obviously worse than that of pure CO_2. The maximum absorption of CO_2 by the two ionic liquids is only 22.3% and 20.9% of that of pure CO_2 under the same conditions. The five times absorption and regeneration cycle experiments of two kinds of ionic liquids were carried out at 70℃ . The results show that the absorption properties of the two ionic liquids are basically stable in five experiments,and the regeneration times have little effect on the CO_2 absorption capacity of the two ionic liquids.