In　China,　Energy　transition　was　proposed　in　the　＂12th　Five-Year　Plan＂　and　gained　resilient　support　by　＂Energy　Revolution＂　announced　by　President　Xi　Jinping　in　2014.　In　Paris　Agreement,　there　are　targets　set　up　for　2100　to　be　well　below　2　degrees　C,　with　ambitious　target　on　1.5　degrees　C.　China　signed　the　agreement　and　will　support　the　global　target.　In　the　meantime,　large-scale　actions　were　initiated　in　2013　by　the　national　action　plan　on　air　pollution　control　for　the　period　from　2013　to　2017.　None　of　these　strategies　has　clear　long-term　target.　In　our　studies,　energy　transition　will　be　decided　by　the　long-term　target　of　CO2　emission　reduction,　air　pollutant　reduction,　and　energy　security.　This　paper　will　present　the　analysis　from　IPAC　model,　by　setting　up　reduction　target　for　CO2　emission　under　the　global　2　degrees　C　and　1.5　degrees　C　target.　Energy　transition,　CO2　emission,　and　air　pollutant　reduction　will　be　discussed　based　on　these　targets.　For　air　pollutants,　SO2,　NOx,　PM2.5,　black　carbon,　and　mercury　will　be　included.　From　the　results,　there　will　be　a　significant　energy　transition　by　large-scale　use　of　renewable　energy,　nuclear　and　the　share　of　coal　will　be　reduced　to　less　than　20%　in　2050　from　66%　in　2015.　Energy　transition　will　also　contribute　to　a　drastic　reduction　in　air　pollutants.