The　pollution　characteristics　and　sources　of　precursor　VOCs　under　different　O3　pollution　conditions　were　analyzed　based　on　the　offline　manual　monitoring　data　of　environment　VOCs　in　the　main　urban　area　of　Handan　in　July　to　August　2021　and　in　combination　with　the　air　quality　monitoring　data　and　meteorological　data　in　the　same　period.　Besides，the　contribution　of　the　involvement　of　VOCs　in　photochemical　reactions　to　O3　was　quantitatively　calculated　based　on　the　IR　value.　Meanwhile，the　Priority　Species　and　emission　sources　of　VOCs　were　pointed　out.　The　results　showed　that：the　daily　average　concentration　during　the　monitoring　was　69.2　μg·m-3；OVOCs　accounted　for　the　highest　proportion；polluted　days　had　significantly　higher　concentrations　of　VOCs　and　had　such　meteorological　characteristics　as　high　temperature，low　humidity　and　low　wind　speed.　The　results　of　the　source　analysis　based　on　the　PMF　model　showed　that　VOCs　mainly　came　from　industrial　emission　sources，fuel　combustion　sources　and　motor　vehicle　exhaust　sources　and　that　the　contribution　of　secondary　generating　source　on　polluted　days　to　VOCs　increased　significantly.　The　mean　of　ΔO3_chem　during　the　monitoring　was　77.38　μg·m-3；and　the　ΔO3_chem/ΔO3_obs　was　61.9%.　Local　O3　production　is　the　main　reason　for　the　increase　in　the　concentration　of　O3.　In　order　to　prevent　O3　pollution，the　highly　active　VOCs　species　in　the　environment，such　as　acetaldehyde，isoprene，toluene/　xylene，ethylene　and　propylene，should　be　mainly　monitored.　In　addition，the　control　of　industrial　emission　sources，motor　vehicle　exhaust　sources，fuel　combustion　sources　and　other　anthropogenic　VOCs　emission　sources　should　be　strengthened.　©　2024　Science　Press.　All　rights　reserved.