Abstract: Based on the ECMWF meridional wind and ozone mass mixing ratio data over the global for 540 months,the basic state of the Hadley Circulation(HC)during the period of 1957 to 2002 and its correlations with the atmospheric ozone variation have been studied.The results show that,① with the strengthening of the HC in winter,the central latitude of the HC moves southward and its vertical position is getting higher,at the same time,the tropospheric O3 amount will increase and the stratospheric O3 will decrease;② there exits a negative correlation between HC intensity and total ozone in the studied region,and ③ the HC strengthening and tropospheric O3 increasing will give a positive feedback mechanism on the global warming,while the decreasing for stratospheric O3 or total ozone amount will give a positive one.