Abstract: Using Li₂CO₃,SiO₂,and K₂CO₃ as the starting materials,potassium-doped lithium silicate absorbents were prepared by high-temperature solid-state reaction.The influence of doping potassium on the crystal structure of the prepared absorbents was studied by comparison of their XRD patterns.The microscopic morphologies of absorbents with different K₂CO₃ content were viewed by sanning electron microscopy.Their CO₂-absorption abilities were measured with a thermogravimetric analyzer.The experimental results showed that doping of potassium could improve appreciably the CO₂-absorption ability of lithium silicate.It was found that lithium silicate absorbed as much as about 48%（weight ratio） of CO₂ under CO₂ atmosphere at 700?℃ within 15?min.