Abstract: VOCs samples have been collected from 5 monitoring sites in Yuxi City from August 2014 to July 2015,and total VOCs have been obtained based on GC-MS analysis.At the same time,the mass concentrations of NO2,CO,SO2,O3 (maximum 8 h),PM10 and PM2.5 have been monitored by air automatic monitoring equipment.Based on these monitoring data,the characteristics of concentration distribution and possible sources of air pollutants in Yuxi City have been discussed.The results show that the average concentrations of VOCs,SO2,NO2,O3,CO,PM10 and PM2.5 in Yuxi are(19.02±18.31),(20.11±25.53),(16.08±11.21),(34.54±32.79)μg·m-3,(1.35±0.82)mg·m-3,(49.51±34.09)μg·m-3 and (28.67±20.85)μg·m-3.From the seasonal distribution,variation of various pollutants is not consistent.The concentration of VOCs is high in autumn and spring,low in winter and summer.The concentration of O3 is the highest in summer.The concentration of SO2 is high in winter and autumn,low in spring and summer.The concentrations of NO2,CO,PM10 and PM2.5 are high in winter and spring,low in summer and autumn.The concentration of VOCs,NO2,O3,PM2.5 and CO nearby the central traffics are higher than that of the other monitoring points,which reflects the significant contribution of the vehicle exhaust.The concentration of SO2 and PM10 in the industrial area is higher,which is a basic characteristic of the industrial with coal-fired.In addition,correlation analysis and an air mass trajectory show that the air quality of Yuxi City will be affected by the regional transmission sources.