CO2　gasification　of　biomass　is　a　prospective　method　to　achieve　carbon　neutrality.　Currently,　most　of　the　attention　is　focused　on　the　study　of　the　pyrolysis　of　biomass　or　the　CO2　gasification　of　biochar,　while　the　exploration　of　the　whole　reaction　process　and　the　relationship　between　the　pyrolysis　stage　and　gasification　stage　are　neglected.　In　this　paper,　the　kinetic　analysis　of　the　whole　CO2　gasification　process　of　corn　straw　was　investigated　with　Thermogravimetric　and　Fourier　transform　infrared　spectroscopy　analysis.　The　results　illustrated　that　the　entire　CO2　gasification　process　of　corn　straw　was　divided　into　two　major　stages,　the　biomass　pyrolysis　stage　and　the　biochar　gasification　stage,　at　618　°C.　Average　activation　energy　determined　by　FWO　and　KAS　methods　were　180.82　and　180.42　kJ/mol　at　the　pyrolysis　stage,　and　239.43　and　232.82　kJ/mol　at　the　biochar　gasification　stage.　The　pyrolysis　of　corn　straw　is　a　multi-stage　process　followed　three　reaction　mechanisms,　diffusional,　nucleation　and　order-based　model.　The　reaction　mechanism　of　the　char　gasification　stage　is　consistent　with　the　F1　and　D2　models.　The　study　was　useful　for　developing　an　industrial　reactor　for　the　CO2　gasification　of　corn　straw.　©　2022　Elsevier　Ltd