The　VOCs　samples　emitted　from　light-duty　gasoline　vehicles　ranging　from　China　II　to　China　IV　was　collected　by　portableemission　measurement　system　(PEMS).　Alkanes,　alkenes　and　aromatics　in　the　exhaust　were　analyzed　using　GC-MS　and　GC-FID.　Results　demonstrated　that　the　emission　reductions　of　VOCs　from　light-duty　gasoline　vehicles　had　been　achieved　as　the　control　technology　become　more　rigorous,　China　II,　China　III　and　China　IV　vehicles　were　49.62,　21.65　and　6.72mg/km,　respectively.　Aromatics　were　the　dominant　VOCs　with　weight　percentages　of　47.43%~60.52%.　The　ozone　formation　potentials　and　SOA　formation　potential　for　different　emission　standards　were　24.64　~　234.14mg/km　and　13.24　~125.32mg/km.　Driving　speeds　also　influenced　the　VOCs　emissions　from　the　tested　China　III　vehicles,　the　VOCs　emission　factors,　ozone　formation　potential　(OFP)　and　SOA　formation　potential　from　light-duty　gasoline　vehicles　were　dropped　with　the　increase　of　the　speed.　©　2016,　Editorial　Board　of　China　Environmental　Science.　All　right　reserved.