Electric　vehicle　sharing　(EVS)　and　bike　sharing　have　been　recognized　as　promising　solutions　to　growingly　serious　problems　of　traffic　congestion,　air　pollution,　and　insufficient　parking　spaces.　This　paper,　based　on　the　current　research　status,　analyzes　and　evaluates　the　effect　of　shared　transportation　on　alleviating　or　solving　the　traffic　and　environmental　issues　of　mega-cities　from　five　perspectives-resource,　environment,　convenience,　economy　and　governance.　Then,　taking　Beijing　as　a　case,　one　of　the　representative　giant　cities,　this　paper　investigates　and　analyzes　the　development　situation,　feasibility,　and　adaptation　of　shared　transportation.　Compared　with　2015,　the　share　of　cars　decreased　by　more　than　3.2%,　and　the　trip　frequency　decreased　by　more　than　55%　for　private　car　owners　in　2016.　Shared　transportation　reduced　energy　consumption,　nitrogen　emissions　and　PM　2.5　by　45　million　liters　of　gasoline,　540,000　tons　and　4.5　billion　mg　just　in　one　year　in　Beijing　in　2016.　The　results　indicate　that　shared　transportation　has　an　important　role　and　potential　in　alleviating　traffic　and　environmental　issues　of　mega-cities.　A　series　of　development　suggestions　and　some　practical　considerations　are　provided　at　the　end,　which　might　supply　good　decision-making　guidance　for　policy　makers.