LCA　method　was　used　to　model　the　life　cycle　of　cement　manufacturing　with　multi-stage　combustion　and　low-NOx　Burner　technology　applied　as　its　low-NOx　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　air　atmosphere.　The　functional　unit　is　1　tonne　clinker.　Data　for　cement　produced　in　MSC　and　LNB　technology　is　analyzed.　The　data　is　collected　from　the　real　clinker　production　situation　and　the　measurement　is　taken　in　12　hours　continuously.