Recycling and utilizing CO2 is very important significance to realizing energy saving and emission reduction.Lithium silicate （Li4SiO4） absorbents for CO2 were prepared by high-temperature solid-state reaction.Thermodynamic equilibrium of Li4SiO4 absorption CO2 was discussed using the HSC5.0 code.The capability of Li4SiO4 for absorption CO2 was investigated using the thermobalance instrument.The crystal structure and surface morphologies of the Li4SiO4 were also analyzed by X-ray diffraction,SEM.The results showed:the absorption reaction is fast in the temperature range 600720℃,the maximum absorption rate（w） was 29.16%;and the desorption reaction began in 750℃,then Li4SiO4 is regenerated.The concentrations of CO2 obviously affect on the absorption speed and the maximum absorption rate;but the flow rate of CO2 little influences the absorption capability.
