LCI　study　is　short　for　＂life　cycle　inventory　study＂.　In　the　situation　of　more　strict　regulation　limit　of　500　mg　NOx　/m(3)　a　demonstration　project　to　reduce　NOx　emissions　with　clinker　production　capacity　of　2000　t/d　in　Beijing　is　supported　by　the　＇Five-twelfth＇　National　Science　and　Technology　Support　Program　of　China　Science　and　Technology　Department.　A　selective　catalytic　reduction　denitration　(SCR　DeNOx)　technology　is　expected　to　be　applied　in　this　project.　LCA　models　the　life　cycle　of　cement　manufacturing　with　SCR　DeNOx　technology　applied　as　its　SCR　system.　The　life　cycle　is　from　the　coal　and　raw　materials　transportation,　through　the　coal　and　raw　meal　grinding,　to　the　clinker　incineration,　and　finally　the　flue　gas　including　NOx　to　the　SCR　reactor.　The　functional　unit　is　1　ton　clinker.　Data　for　cement　produced　in　LNB　technology　as　bench　mark　is　analyzed　and　the　SCR　scenarios　are　to　show　that　the　SCR　reactor　can　be　established　because　the　additional　environmental　impact　is　small　due　to　small　consumptions　of　reducing　agent　and　electricity.　SCR　technology　enable　the　deNOx　efficiency　much　higher　with　small　environmental　impact.