This　study　was　conducted　based　on　the　ISO　14040/14044　standards　to　analyze　the　environmental　impact　caused　by　blast　furnace　slag　utilization　for　ordinary　Portland　cement　production　in　typical　plants　in　Beijing.　In　addition,　sensitivity　analysis　of　resource　consumption,　transport　distance,　the　allocation　methods　and　life　cycle　impact　assessment　model　were　discussed　in　detail.　The　results　showed　that　global　warming　potential　and　acidification　potential　were　the　most　significant　environmental　impacts　resulted　by　slag-based　cement　production,　accounting　for　58.5%　and　21.7%　of　the　total　environmental　impact,　respectively.　Moreover,　the　cement　production　and　energy　generation　phases　accounted　for　66.6%　and　29.6%　of　total　environmental　loads　of　slag-based　cement　from　cradle　to　gate,　respectively.　Sensitivity　analysis　showed　that　the　comprehensive　environmental　impact　of　slag-based　cement　was　sensitive　to　the　consumption　of　limestone　and　energy,　as　well　as　the　allocation　methods　and　life　cycle　impact　assessment　model;　but　was　insensitive　to　the　consumption　and　transport　distance　of　blast　furnace　slag.　Compared　with　traditional　Portland　cement,　except　for　the　approximately　9%　increase　of　human　toxicity　potential,　the　other　impacts　of　slag-based　cement　decreased　to　a　certain　extent.　In　particular,　abiotic　depletion　potential　and　land　use　potential　significantly　reduced　by　72%　and　41%,　respectively.　Therefore,　producing　cement　with　blast　furnace　slag　would　slightly　increase　electricity　consumption,　but　significantly　improve　the　benefits　of　land　resource　and　materials　conservation　and　significantly　decrease　the　comprehensive　environmental　impact　of　cement.　(C)　2015　Elsevier　Ltd.　All　rights　reserved.