A total of 99 volatile organic compounds (VOCs) were measured using online Gas Chromatography Mass Spectrometer/Flame Ionization Detector (GC-MS/FID) at a rural site in Dezhou from November,2017 to January,2018.The VOCs composition,diurnal variation,sources,ozone formation potential (OFP),and secondary organic aerosol (SOA) yields were analyzed.The average volume fraction of total VOCs was (47.74±33.11)×10^-9,and alkanes were the most abundant VOCs species (40.66%).The diurnal variation of VOCs showed high concentration in morning and evening but low concentration at noon.Propane,propylene,benzene,methylbenzene,and dichloromethane were mainly from liquid petrol gas usage,biogenic sources,vehicle emissions,and solvent usage.Back trajectory model analysis showed that air mass from the north might contribute to VOCs concentration.The OFP of alkanes,alkenes,and aromatics were (34.87±33.60),(120.48±118.76),and (59.77±94.14) μg/m³,respectively;and ethylene,propylene,toluene,and m/p-xylene were the top 4 species which contributed most to OFP.The SOA formation was explored and aromatics,including toluene,m/p-xylene,and benzene,contributed most to SOA (93.7%).As a result,reducing aromatics emission will be an important way to control the ozone and PM_2.5 pollution in Dezhou.