This　study　selected　a　petrochemical　industrial　complex　in　Beijing,　China,　to　understand　the　characteristics　of　surface　ozone　(O-3)　in　this　industrial　area　through　the　on-site　measurement　campaign　during　the　July-August　of　2010　and　2011,　and　to　reveal　the　response　of　local　O-3　to　its　precursors＇　emissions　through　the　NCARMaster　Mechanism　model　(NCAR-MM)　simulation.　Measurement　results　showed　that　the　O-3　concentration　in　this　industrial　area　was　significantly　higher,　with　the　mean　daily　average　of　124.6　mu　g/m(3)　and　mean　daily　maximum　of　236.8　mu　g/m(3),　which　are,　respectively,　90.9　and　50.6　%　higher　than　those　in　Beijing　urban　area.　Moreover,　the　diurnal　O-3　peak　generally　started　up　early　in　11:　00-12:　00　and　usually　remained　for　5-6　h,　greatly　different　with　the　normal　diurnal　pattern　of　urban　O-3.　Then,　we　used　NCAR-MM　to　simulate　the　average　diurnal　variation　of　photochemical　O-3　in　sunny　days　of　August　2010　in　both　industrial　and　urban　areas.　A　good　agreement　in　O-3　diurnal　variation　pattern　and　in　O-3　relative　level　was　obtained　for　both　areas.　For　example　of　O-3　daily　maximum,　the　calculated　value　in　the　industrial　area　was　about　51　%　higher　than　in　the　urban　area,　while　measured　value　in　the　industrial　area　was　approximately　60　%　higher　than　in　the　urban　area.　Finally,　the　sensitivity　analysis　of　photochemical　O-3　to　its　precursors　was　conducted　based　on　a　set　of　VOCs/NOx　emissions　cases.　Simulation　results　implied　that　in　the　industrial　area,　the　response　of　O-3　to　VOCs　was　negative　and　to　NOx　was　positive　under　the　current　conditions,　with　the　sensitivity　coefficients　of　-0.16　similar　to-0.43　and　+　0.04　similar　to+　0.06,　respectively.　By　contrast,　the　urban　area　was　within　the　VOCs-limitation　regime,　where　ozone　enhancement　in　response　to　increasing　VOCs　emissions　and　to　decreasing　NOx　emission.　So,　we　think　that　the　VOCs　emissions　control　for　this　petrochemical　industrial　complex　will　increase　the　potential　risk　of　local　ozone　pollution　aggravation,　but　will　be　helpful　to　inhibit　the　ozone　formation　in　Beijing　urban　area　through　reducing　the　VOCs　transport　from　the　industrial　area　to　the　urban　area.