Under　the　new　situation　of　“Two　Mountains”　theory　and　“Dual　Carbon”　goals,　our　country　has　issued　a　series　of　policies　and　preferential　conditions　to　encourage　the　preparation　of　gypsum　cementitious　materials　from　industrial　by-product　gypsum,　including　calcined　gypsum,　α　high-strength　gypsum,　mixed　phase　gypsum,　et　al.　So　far,　there　are　few　carbon　footprint　calculation　reports　on　gypsum　cementitious　materials　in　China.　In　this　paper,　the　carbon　footprint　calculation　model　of　gypsum　cementitious　materials　prepared　from　industrial　by-product　gypsum　was　established　based　on　life　cycle　assessment　method,　which　was　demonstrated　through　the　production　of　α　high-strength　gypsum　from　phosphogypsum.　The　results　show　that　the　carbon　footprint　in　three　stages　of　raw　material　acquisition,　production　and　transportation　of　α　high-strength　gypsum　product　is　3.　95,　288.　04　and　14.　31　kg　CO2　eq　/　t,　respectively,　and　the　total　emission　is　306.　3　kg　CO2　eq　/　t.　The　carbon　emission　in　production　stage　is　the　largest,　which　is　an　important　segment　to　reduce　energy　consumption,　reduce　carbon　emission　and　save　costs.　The　carbon　footprint　calculation　model　established　in　this　paper　is　applicable　to　the　carbon　footprint　calculation　for　calcined　gypsum,　α　high-strength　gypsum,　anhydrite,　mixed　phase　gypsum,　et　al.　©　Bulletin　of　the　Chinese　Ceramic　Society　Press.　All　Rights　Reserved.