Abstract: The mobile AML-3 lidar system was used to monitor the ozone distribution and impact factors in Beijing from 7^th May to 9^th June, 2011. The data from the Differential Absorption Lidar were analyzed and pollutant monitoring systems were created in this study. The vertical distributions of the ground ozone were observed at different periods in the daytime, and the correlations between ozone concentrations and meteorological elements (e.g., temperature, wind speed and wind direction) were analyzed. The results showed a significant difference of the near surface ozone concentrations between different monitored periods. The peak value appeared at 14:00 while the valley value occurred at 06:00. The ozone concentration distribution in the upper layer is non-uniform, since the airflow in the upper layer can easily transport pollutants to the lower layer and cause ozone enrichment in the atmospheric boundary layer. The negative effect on the atmosphere diffusion caused by the stabile boundary layer is the main reason for ozone pollutions. The ozone diurnal trends and the diurnal temperature trend have a very significant positive relationship with the correlation coefficient about 0.74. Turbulence caused a positive effect on wind speed and ozone concentration while horizontal diffusion caused a negative effect on wind speed and ozone concentration. The research on wind direction effects showed that the wind came from northeast side has more significant impact on Beijing''s ozone pollution.