The　ambient　VOCs　were　monitored　in　the　eastern　urban　area　of　Beijing　city　from　October　16th　to　November　27th,　2014.They　were　analyzed　by　an　off-line　analysis　method　of　SUMMA　tank　sampling　and　GC-MS.　The　VOCs　results　during　APEC　showed　that　the　24h　daily　average　concentrations　of　TVOCs　were　49.12×10-9,　25.17×10-9　and　23.38×10-9　respectively　during　Oct　16~30　(before　APEC),　Nov　5~11　(APEC)　and　Nov　12~27　(after　APEC),　presenting　a　falling　trend　with　time;　however,　the　daytime　average　concentrations　(8:00~18:00)　were　41.43×10-9,　17.36×10-9　and　20.08×10-9　respectively,　the　lowest　daytime　concentrations　happened　during　APEC.　Meanwhile,　the　VOCs　chemical　profiles　also　showed　obvious　differences　between　APEC　and　before/after　APEC,　volume　mixing　ratio　of　alkenes　increasing　and　those　of　alkanes　and　aromatics　decreasing.　Then　the　relationship　between　VOCs　and　meteorological　factors　was　concluded,　based　on　the　VOCs　data　before　and　after　APEC,　the　most　important　impact　being　from　temperature　(r=0.74),　followed　by　the　relative　humidity　(r=0.67)　and　no　significant　correlation　with　wind　speed.　Finally,　the　reduction　emissions　of　the　15main　compounds　were　calculated　by　using　Beijing　VOCs　emission　inventory　and　VOCs　chemical　profiles　of　various　sources.　A　great　well　correlation　between　their　emission　abatement　and　their　daytime　average　concentration　change　during　APEC　were　found,　with　the　correlation　coefficient　of　0.76~0.80,　which　verified　the　accuracy　of　Beijing　VOCs　emission　inventory.　©　2016,　Editorial　Board　of　China　Environmental　Science.　All　right　reserved.