Abstract: In order study the emission characteristics of VOCs from the petrochemical industry and associated environmental impacts, three typical local refineries in Shandong Province were selected to carry out sample collection and chemical analysis. The maximum incremental reactivity (MIR) method and secondary organic aerosol formation potential (SOAP) method were used to quantify the corresponding contributions to the generation of secondary pollution. The results of the study showed that the composition of VOC emissions from different types of production enterprises varied greatly. From the perspective of volume concentrations, aromatics (30.4%-92.2%) were the main emission compounds at each sampling point of enterprise A. The emissions of enterprise B were dominated by alkanes (15.4%-53.8%), alkenes and alkyne (11.4%-71.7%) and oxygenated VOCs (0.1%-53.8%). Enterprise C mainly emitted alkanes (6.1%-95.3%) and alkenes and alkyne (1.2%-93.1%). From the perspective of composite source profiles, enterprise A used aromatics as the main compounds, among which ethylbenzene, benzene, styrene and toluene were high-emission compounds. The proportion of alkanes, alkenes and alkyne, and oxygenated VOCs was high in enterprise B, with 1-butene, methyl ethyl ketone, trans-2-butene, isobutane and toluene as the main compounds. Enterprise C mainly emitted alkane compounds, including isobutane, propane and cyclopentane. The evaluation results of ozone formation potential (OFP) showed that aromatics including ethylbenzene, styrene, benzene and toluene contributed the most to enterprise A. In enterprise B, alkenes and alkyne including 1-butene, trans-2-butene and isoprene accounted for the highest proportion. The high-contribution compounds in Enterprise C were alkenes and alkyne and alkanes as, of which propylene, isobutane, m/p-xylene and cis-2-butene were the key active compounds. The evaluation results of SOAP showed that the SOA generation of each enterprise was dominated by aromatics, and the main active compounds were toluene, styrene, benzene and m/p-xylene. The research indicated that the VOCs emitted by local refineries were complex and varied with the processes. A targeted VOCs emission reduction strategy should be formulated based on the selected key active compounds.