Abstract: Using the 44 years(1958—2001)NCEP data and ozone mixing ratio data,calculating the global ozone distribution at tropopause.The result are as follows:① The global ozone mixing ratio at tropopause is zonality distribution.The high value regions locate in the mid-latitude of the two hemisphere and south pole,the low value regions locate in the equator and the north pole,and those regions have correspondence connection with the geopotential field and temperature field at tropopause.② The zonal mean sections of ozone and temperature between 400—70?hPa indicate that the different physical and chemical process in upper troposphere/lower stratosphere lead to the different vertical distribution of the temperature and ozone.③ The interannual(interdecadal)variations of the tropopause zonal-mean ozone anomalies is remarkable.The spatial-temporal variation of the tropopause ozone in Southern Hemisphere is acuter than Northern Hemisphere,Ozone variation is most instable in South Pole and is most stable in the low-latitude and equator regions.④ Each season of global tropopaus ozone distribution is very similar to the geopotential distribution in the two polar regions.In the low-latitude and equator regions,the global tropopause ozone distribution is similar to the temperature distribution to some extent.⑤ In the tropopause breakpoints regions,the max tropopause ozone occurs in the spring and the minimum occurs in fall.The latitude of the max tropopause ozone in the tropopause breakpoints regions can reach highest-latitude in summer and lowest-latitude in winter.⑥ The seasonal variation of the global tropopause zonal mean ozone mass mixing ratio anomalies has obvious quasi-semiyearly variation,and has opposite connection between Northern Hemisphere and Southern Hemisphere.