Effects　of　Al-pillaring　and　alkali　metal　(Li,　Na,　K　and　Cs)　doping　on　CO2　adsorption　property　of　montmorillonite　are　investigated.　Physicochemical　properties　of　the　materials　are　studied　by　means　of　X-ray　diffraction　and　N-2　adsorption-desorption,　and　their　CO2　adsorption　behaviors　are　studied　using　the　thermogravimetic,　CO2　temperature-programmed　desorption,　and　in　situ　diffuse　reflectance　fourier　transform　infrared　spectroscopic　techniques.　Compared　with　montmorillonite,　Al-pillaring　improves　its　specific　surface　area　(up　to　242　m(2)/g)　and　pore　structure.　The　results　show　that　CO2　adsorption　capacity　decreases　in　the　sequence　of　5　wt%　Cs/Al-PILC　＞　5　wt%　K/Al-PILC　＞　5　wt%　Na/Al-PILC　＞　5　wt%　Li/Al-PILC　＞　Al-PILC　＞　montmorillonite.　Among　all　of　the　samples,　the　5　wt%　Cs/Al-PILC　sample　exhibits　the　highest　adsorption　capacity　(2.325　mmol/g)　at　50　degrees　C.　According　to　the　adsorption　kinetics　analysis,　CO2　adsorption　on　montmorillonite　is　mainly　chemical　adsorption,　so　alkalinity　of　the　adsorbent　is　improved　by　doping　a　proper　amount　of　alkali　metal.　Meanwhile,　the　adsorbed　CO2　is　stored　in　the　form　of　bicarbonates　and　carbonates.　Moreover,　the　montmorillonite　adsorbents　also　have　good　regeneration　properties.　We　believe　that　the　results　obtained　in　the　present　work　provide　more　options　for　development　of　CO2　adsorption　adsorbents　with　high　performance.