The　pollution　characteristics　of　surface　ozone　and　its　response　to　meteorological　factors　were　studied　based　on　monitoring　in　July　2019　in　Shijiazhuang　City,　China.　Furthermore,　the　WRF-CMAQ　model　coupled　with　O3　isopleths　(EKMA　curves)　were　applied　to　explore　the　non-linear　response　relationship　of　O3　to　precursors　VOCs　and　NOx,　aiming　to　identify　a　suitable　precursor　control　strategy.　The　results　showed　that　the　days　with　the　maximum　daily　8-hour　average　ozone　concentration　(MDA8　O3)　exceeded　the　standard　by　70.9%.　The　nonattainment　days　were　usually　accompanied　by　higher　temperature,　lower　relative　humidity,　and　low　winds,　and　the　south　and　southeast　winds　occurred　frequently.　The　O3　formation　was　in　the　strong　VOC-limited　regime　in　the　urban　area　of　Shijiazhuang,　whereas　it　was　in　the　NOx　and　VOCs　transition　regime　in　suburban　areas.　As　for　the　urban　area,　under　the　condition　of　single　NOx　emission　reduction,　O3　pollution　improved　when　continuous　NOx　emission　reduction　was　higher　than　50%　during　the　nonattainment　days.　By　contrast,　during　the　non-polluted　days,　O3　concentrations　would　not　rebound　when　the　reduction　ratio　of　NOx　and　VOCs　was　higher　than　1.　In　conclusion,　VOCs　reduction　should　be　the　priority　for　emission　reduction　plans　in　urban　areas,　whereas　all　different　NOx　and　VOCs　ratios　led　to　a　decline　in　O3　concentration　in　the　suburban　areas,　and　a　VOCs:NOx　of　1:2　was　recommended.　©　2022,　Science　Press.　All　right　reserved.