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In the autumn of 2008,the vertical profiles of ozone and meteorological parameters in the low troposphere (0-1000 m) were observed at two sites around Beijing,specifically urban Nanjiao and rural Shangdianzi.At night and early ming,the lower troposphere divided into two stratified layers due to temperature inversion.Ozone in the lower layer showed a large gradient due to the titration of NO.Air flow from the southwest brought ozone-rich air to Beijing,and the ozone profiles were marked by a continuous increase in the residual layer at night.The accumulated ozone in the upper layer played an important role in the next day’s surface peak ozone concentration,and caused a rapid increase in surface ozone in the ming.Wind direction shear and wind speed shear exhibited different influences on ozone profiles and resulted in different surface ozone concentrations in Beijing.