In　China,　petro-chemical　manufacturing　plants　generally　gather　in　the　particular　industrial　zone　defined　as　PIZ　in　some　cities,　and　distinctly　influence　the　air　quality　of　these　cities　for　their　massive　VOCs　emissions.　This　study　aims　to　quantify　the　local　and　regional　impacts　of　PIZ　VOCs　emission　and　its　relevant　reduction　policy　on　the　surface　ozone　based　on　WRF-Chem　model,　through　the　case　study　of　Beijing.　Firstly,　the　model　simulation　under　the　actual　precursors＇　emissions　over　Beijing　region　for　July　2010　is　conducted　and　evaluated,　which　meteorological　and　chemical　predictions　both　within　the　thresholds　for　satisfactory　model　performance.　Then,　according　to　simulated　H2O2/HNO3　ratio,　the　nature　of　photochemical　ozone　formation　over　Beijing　is　decided,　the　VOCs-sensitive　regime　over　the　urban　areas,　NOx-sensitive　regime　over　the　northern　and　western　rural　areas,　and　both　VOCs　and　NOx-mixed　sensitive　regime　over　the　southern　and　eastern　rural　areas.　Finally,　a　30%　VOCs　reduction　scenario　(RS)　and　a　100%　VOCs　reduction　scenario　(ZS)　for　Beijing　PIZ　are　additional　simulated　by　WRF-Chem.　The　sensitivity　simulations　imply　that　the　current　30%　reduction　policy　would　bring　about　an　O-3　increase　in　the　southern　and　western　areas　(by　+　4.7　ppb　at　PIZ　site　and　+　2.1　ppb　at　LLH　station),　and　an　O-3　decrease　in　the　urban　center　(by　1.7　ppb　at　GY　station　and　2.5　ppb　at　DS　station)　and　in　the　northern　and　eastern　areas　(by　1,2　ppb　at　MYX　station),　mainly　through　interfering　with　the　circulation　of　atmospheric　HOx　radicals.　While　the　contribution　of　the　total　VOCs　emission　of　PIZ　to　ozone　is　greatly　prominent　in　the　PIZ　and　its　surrounding　areas　along　south-north　direction　(12.7%　at　PIZ　site　on　average),　but　slight　in　the　other　areas　of　Beijing　(　＜　3%　in　other　four　stations　on　average).