The　pollution　characteristics　of　surface　ozone　and　its　response　to　meteorological　factors　and　precursors　were　studied　based　on　monitoring　and　Model-3/CMAQ　modeling　from　May　to　August　2018　in　Handan　City,　China.　The　monitoring　results　showed　that　the　maximum　daily　8-hour　average　ozone　concentration　(MDA8　O3)　ranged　from　38.0-238.0　μg•m-3,　and　the　nonattainment　for　ozone　reached　44.7%　during　the　studied　period,　indicating　the　more　severe　photochemical　pollution　in　summer　in　Handan　City.　The　ozone　concentration　was　positively　correlated　with　temperature　(R=0.74　on　nonattainment　days　and　0.42　on　attainment　days),　but　negatively　correlated　with　relative　humidity　(R=-0.63　on　nonattainment　days　and　-0.58　on　attainment　days),　demonstrating　the　role　of　photochemistry　in　the　surface　ozone　of　Handan　City.　Moreover,　the　highest　ozone　level　occurred　at　wind　speeds　higher　than　2.25　m•s-1　or　lower　than　1.00　m•s-1　during　ozone　nonattainment　days,　which　indicated　that　regional　transport　and　local　accumulation　can　both　cause　serious　ozone　pollution　in　the　city.　Regarding　the　response　of　ozone　to　its　precursors　(VOCs　and　NOx),　model　simulation　results　based　on　the　brute　force　method　showed　the　stronger　positive　sensitivity　to　VOCs,　but　a　weak　negative　sensitivity　to　NOx.　Therefore,　reduction　of　anthropogenic　VOCs　emissions　is　the　key　to　improving　ozone　pollution　in　Handan　City.　We　used　the　propylene-equivalent　method　to　identify　the　importance　of　alkene　and　aromatic　species　for　ozone　pollution　during　ozone　nonattainment　days.　©　2020,　Science　Press.　All　right　reserved.