Abstract: For revealing the adsorption characteristics of coal and shale on CO₂, the main mechanism and influence factors of CO₂ adsorption capacity was studied with theories. The paper studied coal and shale adsorbed CO₂ gas phenomena by using WY-98A adsorption determinator systematically. Then the adsorption characteristics of CO₂ had been obtained according to a large number of tests results, and different adsorption characteristics and change rules were analyzed. The absorption effect of the imitated coal and shale samples had been evaluated and a suitable model for describing the adsorption of CO₂ about coal and shale were selected. Finally, the adsorbed amount of CO₂ for 1 t coal and 1 t shale were calculated in Nanyangpo, Chensilou and Hongmiao mining areas. It is better to describe the CO₂ adsorption about coal and shale by Dubinin-Astakhov(D-A).