Abstract: In terms of monthly total column ozone data by the European Centre for Medium-Range Weather Forecasts (ECMWF) for 37a(1979—2015) and the combine of TOMS and SBUV from NASA for 30a(1979—2008),the multi-timescale evolution features of total ozone over the Tibetan Plateau and its depletion relative to the other regions at the same latitude of the plateau are analyzed.Based on these data,the impacts of the solar flux on total ozone depletion are discussed.The primary results show as follows,firstly,the Plateau ozone has trended down over the past 37 years,more prominent in winter and spring,that is the downtrend over the plateau is more obvious than those over the non-plateau.Secondly,the Plateau ozone have been reduced with lesser extent in various seasons during the past 37 years,as compared to that over the period of 1979—2008,namely,the downward trend has slowed in recent years.Furthermore,the Plateau ozone and its depletion present a variation period of quasi-11 years in each season,moreover,ozone depletion with the high or low index corresponds to the solar cycle in spring and summer,and the former lags behind the latter.