Abstract: Based on meteorological data and pollutant monitoring data in Lihu station and Huadu station of Guangzhou in 2004,the annual,weekly and diurnal changes of ozone concentration in Guangzhou were discussed by SPSS software and Excel software.The relationships between ozone and pollutants(CO,NO,NO2,SO2 and PM10) as well as meteorological conditions were also analyzed.The results indicate that two peak values of ozone concentrations during one year appear in June and October,respectively.The diurnal average concentration of ozone is obvious negative correlation with NOx,NO,CO and relative humidity,and it is obvious positive correlation with PM10 and temperature.Under the conditions of the higher temperature and the lower humidity as well as clearness weather,it is easy to result in the higher ozone concentration in Guangzhou.