Tracing　and　controlling　vehicles　emissions　present　a　great　challenge　in　reducing　air　pollution　and　improving　air　quality　in　Beijing.　On-road　emissions　(CO　and　NOx)　and　fuel　consumption　(FC)　characteristics　of　tourist-oriented　heavy　duty　diesel　vehicles　were　analyzed　based　on　63,　226　records　of　instantaneous　data　obtained　in　Beijing　using　PEMS.　The　results　revealed　that　CO　and　NOx　emission　factors　and　FC　dropped　from　2.87　g/km,　10.30　g/km,　and　164.86　g/km　to　2.44　g/km,　9.45　g/km,　and　149.79　g/km　respectively,　when　eight　stop-and-go　actions　were　eliminated.　These　reductions　indicated　that　each　stop　contributes　1.86%　of　CO,　1.03%　of　NOx,　and　1.14%　of　FC　respectively　to　the　total　emission　and　FC　of　a　test　run.　Furthermore,　CO　emission　rate　was　highest　at　the　moderate　speed,　while　NOx　emission　rate　and　FC　rate　grows　with　the　increase　of　average　speed.　These　findings　provided　a　base　reference　to　the　accurate　estimation　of　the　emissions　and　FC　of　diesel　vehicles　in　Beijing.　©　ASCE.