Abstract: NO 2 is one of the important gases in stratospheric chemistry,it is the partner of the heterogeneous reaction on Polar Stratospheric Cloud(PSC's) which causes the happening of the Antarctic Ozone Hole,and it can also react with ClO to form ClONO 2,and thus control the destruction of ozone caused by man made chlorine compounds.It's of significent importance to take the measurement of NO 2 in Antarctica.We have already continually take the measurement of total column amount of O 3,NO 2 as well as stratospheric O 3,NO 2,this paper analyses the seasonal variation of NO 2 and its relationship to O 3 during the Antarctic Ozone Hole in the years 1993-1995 and points out that the decrease of atmospheric NO 2 is one important reason of the increase of Antarctic Ozone Hole.