Abstract: Based on total ozone monthly mean grid data derived from TOMS(Total Ozone Mapping Spectrometer) during the periods of 1979 to 1992 (defined asⅠperiod) and 1997 to 2008 (Ⅱperiod),the characteristics of temporal-spatial distribution and latitude-band of atmospheric ozone over the low-latitude regions in East Asia have been comparatively studied in detail.The results showed that,① compared to theⅠ period,the overall level of the regional atmospheric ozone concentration during Ⅱ period has been reduced;regional ozone concentrations are generally lower than other regions of the same latitude,which bears significant relationship with the topography and atmospheric circulation;②the regional and the latitude-band averaged ozone concentration during Ⅰ and Ⅱ periods shows different seasonal and interannual variation characteristics.And the difference not just exist in north and south area,but also near-equatorial latitude band and high latitude band;③ except for the annual cycle,the temporal distribution of the regional averaged ozone over the studied area has a 1.3—2.3 a main cycle,the longth of which is slightly lower than Quasi-biennial oscillation(QBO).While for the Equatorial latitude-band,there exists a maintained evident QBOperiod.It should be noted that,the 1.3—2.3 a cycle shows a seesaw effect between northern and southern hemispheres.