Life　cycle　assessment　(LCA)　was　carried　out　to　quantify　and　analyze　the　environmental　impact　and　benefit　caused　by　the　utilization　of　coal　gangue　as　alternative　raw　material　and　fuel　in　cement　clinker　production.　The　optimal　dosage　of　coal　gangue　was　determined　by　comparing　among　different　mixing　amount　scenarios　and　Portland　cement　clinker　(clinker　without　adding　any　waste)　considering　the　phases　of　coal　gangue　disposal,　transportation,　and　raw　meal　grinding　and　clinker　calcination.　The　results　showed　that:　1)　After　adding　coal　gangue　to　the　raw　meal,　almost　all　the　considered　environmental　impacts　of　cement　clinker　including　human　toxicity　potential,　photochemical　smog　potential,　especially　abiotic　depletion　potential　decreased　significantly.　However,　global　warming　potential　and　acidification　potential　increased　slightly　in　comparison　with　Portland　cement　clinker.　2)　Compared　with　the　Portland　cement　clinker,　the　single　environmental　indicator　reduced　after　adding　coal　gangue　and　the　indicator　decreased　gradually　with　the　dosage　increasing.　©　(2015)　Trans　Tech　Publications,　Switzerland.