Carbon dioxide（CO,2,） chemical absorption method has matured and is an effective industrial carbon capture technology.Anhydrous phase change absorbents exhibit high absorption rates and low desorption energy consumption.However,in the industrial CO,2, absorption process,the water in the gas source is absorbed by the anhydrous phase change absorbent,affecting the subsequent absorption effect.The performance changes of the typical anhydrous mixed amine phase change absorbent（diethanolamine-pentamethyldiethylenetriamine-ethylene glycol,P-T-EG） in capturing CO,2, from simulated flue gas containing water were investigated.The effects of water accumulation on the rich phase ratio（volume ratio）,CO,2, loading,and the moisture content（mass fraction,the same as below） of lean and rich phases after phase separation were explored.The results show that the accumulation of water is beneficial to reducing the viscosity of the rich phase and increasing the rich phase ratio.As the number of cycles increases,the rich phase ratio increases,and the moisture content of the lean phase is lower than that of the rich phase.The impact of water accumulation on desorption equilibrium is weak.Using Aspen Plus,the desorption process of P-T-EG rich phase with different moisture contents was calculated.It is found that at a reboiler temperature of 100℃ and a condensation temperature of 35℃,P-T-EG+10%H,2,O（10%is the moisture content） can achieve a balance between absorption and desorption water.At this time,the mass loss of amine in the desorption column is 1.05×10,-10,（mass ratio）.