Carbon capture/storage (CCS) is of great significance to solve the problems of greenhouse effect,climate warming,environmental pollution and energy crisis.More attention has been paid on Cabased sorbents because their high adsorption capacity and lower cost.The characteristics and adsorption mechanism of calcium-based CO_2 sorbents are introduced.This paper focuses on two modification methods of calcium-based sorbents,including incorporation of refractory metals into CaO and morphology modification,which are effective to improve the stability.Single and co-doping by metal oxides with high Tamman temperatures or more oxygen vacancies,such as Zr,Ce,Mn,Mg,Al,are introduced.The influence of synthetic methods,conditions of adsorption-desorption,content of inert material,and the precursor on the performance of calcium-based sorbents is discussed.The hollow and solid spherical particles of calcium-based sorbents prepared by polystyrene beads,carbon aerogels,and carbon sphere,have favorable adsorption capacity and stability.However,there is still a long way to go for realizing the industrial application.It is urgent to explore the relationship between the structure and the performance,so as to provide the theoretical guidance.