The　substitution　of　electric　vehicle　(EV)　for　conventional　gasoline　vehicles　is　a　promising　new　way　to　reduce　greenhouse　gases　(GHG)　emission　in　China.　This　study　compared　the　environmental　impact　on　climate　change　between　electric　vehicle　power　system　and　internal　combustion　engine　vehicle　(ICEV)　power　system.　A　life　cycle　analysis　model　was　built　with　the　GaBi　software　to　analyze　the　GHG　emission　with　IPCC　methodology.　The　life　cycle　of　vehicle　was　divided　into　four　phases　including　raw　material　production　phase,　auto　parts　production　and　assembly　phase,　transportation　phase　and　use　phase.　Three　scenarios　of　the　electric　power　mix　were　carried　out　for　the　sensitivity　analysis.　Overall,　the　global　warming　potential　(GWP)　of　ICEV　was　reduced　by　69.8%　compared　with　that　of　EV.　However,　when　considering　the　whole　vehicle　use　phase,　EV　provided　45%　benefits　of　carbon　reduction　than　ICEV.　The　results　of　sensitivity　analysis　showed　that　GHG　emission　decreased　with　improving　of　cleaner　energy　utilization.　The　results　concluded　that　EV　can　reduce　GHG　emission　compared　to　ICEV.　Electricity　consumption　in　the　use　stage,　raw　materials　stage　and　production　stage　were　the　key　processes　for　controlling　GHG　emission　during　EV　management.