Abstract: In order to understand the characteristics of volatile organic compounds in Yibin City in winter, air samples were collected at two sites in December 2016. Eighty-nine species of volatile organic compounds (VOCs) were measured by using pre-concentration-GC-MS method. This study investigated the volume fraction of VOCs and its ingredients. In addition, the main sources of VOCs were also identified. The results showed that the average volume fraction of VOCs was 35.10×10^-9, and the highest volume fraction was 67.34×10^-9 while the lowest volume fraction was 20.58×10^-9. Aromatic hydrocarbons were the highest proportion in the monitored species category, followed by alkanes and halogenated hydrocarbons. Species with a large volume fraction were benzene, toluene, methyl chloride, dichloromethane, isobutene, isopropanol, n-butane and so on. Source apportionment for VOCs in Yibin City was taken by CMB model and emission inventory method. The CMB results indicated 6 major contribution sources of VOCs were vehicle source, hydrocarbon volatile source, solvent source, industry source, biomass burning. The results obtained from the emission inventory in 2015 were the industry source, solvent source, vehicle source, fixed burning that contribute 35.5%, 24.5%, 28.9%, 8.0%, respectively. Overall, the main sources of VOCs in the winter ambient air in Yibin City are vehicle, solvent and industry.