In　this　paper,　the　populations　and　emission　factors　of　vehicles　with　different　emission　standards　were　obtained　by　abundant　literature　investigation　and　sampling　survey.　Then　vehicular　emission　inventory　was　developed　for　the　Beijing-Tianjin-Hebei(BTH)　region　in　2008,　and　emission　characteristics　were　analysed　at　the　same　time.　The　results　indicated　that　total　emissions　of　CO,　NOx,　HC　and　PM10　were　264.05×104,　78.79×104,　63.09×104　and　4.83×104　t/a,　respectively.　Vehicles　with　State　0　standard　were　the　major　emission　source,　and　the　emission　proportions　for　CO,　NOx,　HC　and　PM10　were　56.74%,　35.51%,　47.55%　and　45.90%,　respectively.　The　two　major　contributors　to　CO　and　HC　were　motorcycles　and　light　duty　vehicles.　CO　from　these　two　types　accounts　for　40.92%　and　35.43%,　and　HC　accounts　for　55.18%　and　28.33%　of　the　total　vehicular　emission　respectively.　Heavy　duty　trucks,　heavy　duty　vehicles　and　trails　were　the　main　contribution　sources　of　NOx　and　PM10.　They　made　significant　contribution　about　88.59%　to　the　total　NOx　emissions,　while　75.10%　to　the　total　PM10　emissions.　Beijing　had　lower　average　emission　for　a　single　car　than　the　other　cities　in　the　BTH.　Characteristics　of　cites＇　average　CO　and　HC　emission　were　similar　with　each　other,　so　did　NOx　and　PM10.