Pyrolysis　behavior　and　kinetics　of　three　typical　agroforestry　biomasses　including　apricot　shell,　wheat　straw　and　poplar　sawdust　were　investigated　by　thermogravimetric　mass　spectrometry　(TG-MS).　The　results　show　that　the　differences　of　the　main　components　make　the　three　biomasses　exhibit　different　characteristics　in　the　main　reaction　range　(200-450　).　It　is　found　that　the　average　activation　energy　of　apricot　shell,　straw　and　sawdust　is　188.22,　220.77,　and　175.87　kJ/mol,　respectively　based　on　the　typical　isoconversional　methods.　The　average　activation　energy　of　each　component　in　biomass　was　calculated　by　the　distributed　activation　energy　model　(DAEM)　method,　indicating　that　there　is　a　fourth　component　with　high　average　activation　energy　in　biomass　(297.44　kJ/mol　for　apricot　shell,　284.35　kJ/mol　for　straw　and　309.96　kJ/mol　for　sawdust).　The　activation　energy　of　hemicellulose　and　cellulose　shows　an　increasing　order　of　straw　©　2022　Science　Press.　All　rights　reserved.