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The increase of CO2 in atmosphere is a main factor leading to "greenhouse effect",which causes more and more serious global environmental problems.The reduction of CO2 is a challenge for the survival of human beings,and it is also a big technical problem.CO2 fluid-rock interaction is a key scientific problem involved in geological storage.The CO2 fluid-rock interaction has a variety of multi-scale changes.Due to great differences in the quantity of surface atoms and surface energy between micron-nano-sized minerals,and ions and crystals,the speed and efficiency of CO2 fluid-rock interaction on a micron-nano scale are much higher than those on other scales.As is known from the natural world,the micron-nano structures of pores and the surface chemical modification of natural porous minerals (zeolite,diatomite,sepiolite,palygorskite,halloysite,etc.) should be further investigated,which can be used as the micron-nano -mineral porous materials with high capacity and high efficiency for capturing CO2.Through simulating the adsorption capacity and process of CO2 by minerals in the natural world,the micron-nano technology is applied to calcium- and magnesium-based minerals (olivine,pyroxene,feldspar,clay,etc.) so as to improve the activity of calcium and magnesium and enlarge the reaction contact area.In this way,the efficiency of capturing and storage of CO2 by calcium- and magnesium-based minerals can be greatly improved.These minerals can also be used as the micron-nano-mineral materials with large capacity and high efficiency for capturing and storing CO2.