The　objective　is　to　know　how　the　CO2　emits　and　how　much　the　CO2　emits　due　to　the　cement　manufacture　in　both　direct　and　indirect　ways　with　the　increasing　concerns　about　the　global　warming　and　the　cement　plants　emitting　huge　CO2.　A　precise　method　to　calculate　CO2　emissions　including　three　processes　was　established　in　this　paper　and　a　case　study　was　provided.　From　the　case　of　23　typical　plants　in　China,　we　can　see　the　amount　of　CO2　emissions　at　the　right　level.　The　summary　of　CO　2　emissions　consists　of　emissions　from　raw　materials,　fuels　and　electricity.　The　average　result　of　the　23　typical　plants　is　0.74　t　CO　2　per　ton　clinker　in　this　study.　Therefore,　CO2　emissions　from　these　typical　cement　plants　were　pictured　and　then　measured.　The　creative　point　is　that　an　approach　provides　a　basic　framework　to　identify　various　situations　in　different　cement　plants　in　China　and　other　in　the　rest　of　the　world.　The　framework　would　be　useful　in　quantitatively　evaluating　CO2　emissions　for　government　to　know　precisely　CO2　emissions　in　the　cement　plants.　©　Shanghai　Jiaotong　University　and　Springer-Verlag　Berlin　Heidelberg　2012.