According　to　the　current　status　of　coal-to-olefin　industry　in　China,　the　environmental　impacts　of　coal-to-polypropylene　production　from　two　different　routes,　(a)　pulverized　coal　pressurized　gasification　to　Davy　methanol　synthesis　to　DMTO-based　polypropylene　(HDDMTO)　process,　and　(b)　GSP　gasification　to　low-pressure　methanol　synthesis　to　Lurgi　MTP-based　polypropylene　(GLLMTP)　process,　were　analyzed　and　compared　using　life　cycle　assessment　(LCA),　based　on　a　functional　unit　of　producing　1　t　polypropylene.　The　results　show　that　the　energy　consumption　of　HDDMTO　process　and　GLLMTP　process　is　4.23　tce/t　and　4.22　tce/t,　respectively;　the　carbon　emission　is　7.95　tCO2/t　and　7.40　tCO2/t,　respectively,　and　the　water　consumption　is　13.74　t/t　and　17.56　t/t,　respectively.　Moreover,　the　fossil　resource　scarcity　(FFP)　mainly　comes　from　mining　and　mineral　processing　stage.　Global　warming　potential　(GWP)　is　from　the　energy　supply　stage,　low-temperature　methanol　washing　stage　and　gasification　stage.　While　other　impacts,　such　as　acidification　potential　(AP),　fine　particulate　matter　formation　depletion　(PMFP),　marine　eutrophication　(MEP),　stratospheric　ozone　depletion　(ODP),　ecosystem　damage　ozone　formation　(EOFP)　and　human　damage　ozone　formation　(HOFP),　mainly　come　from　energy　supply　stage　(power　supply　and　utilities),as　well　as　coal　mining　and　mineral　processing　stage.　Furthermore,　the　largest　environmental　impact　is　FFP,　followed　by　GWP,　EOFP,　HOFP,　AP,　PMFP,　MEP,　and　the　lowest　is　ODP.　In　the　future,　in　order　to　reduce　the　FFP　environmental　impact,　a　new　processing　device　with　higher　methanol　conversion　rate　can　be　replied,　or　a　circular　economy　can　be　developed　to　collect　waste　olefin　for　reprocessing　and　recycle.　In　terms　of　reducing　GWP,　carbon　capture,　conversion　or　storage　processes　can　be　deployed　in　the　rectisol　process　to　reduce　carbon　emissions.　©　2022　Taiyuan　University　of　Technology.　All　rights　reserved.