Abstract: Based on the tropospheric column ozone calculated from satellite remote sensing data from 2005 to 2020 and long-term accumulated ozone sounding profile data from multiple global stations, a quantitative assessment of the proportion of tropospheric ozone in the total ozone column was conducted. The results showed that, the annual average tropospheric ozone accounts for approximately 9% to 13% of the total ozone amount, with significant spatial and seasonal characteristics. Spatially, the proportion increases from the equator towards high-latitude regions before decreasing, with the highest values occurs in mid-latitude regions, reaching approximately 12% to 13%, while the lowest is observed in the equatorial and high-latitude regions, only 9% to 10%, moreover, the Northern Hemisphere is higher than the Southern Hemisphere. Seasonally, the proportion of tropospheric ozone is highest in summer, with its peak located closest to the polar regions, while in winter, the peak shifts toward equatorial latitudes. For the Tibetan Plateau region, the proportion of tropospheric ozone is influenced by factors such as terrain height and the seasonal variation of the tropopause height. Compared with other regions at the same latitude, the average proportion of tropospheric ozone in this region is lower by 1.82% to 2.74%. Furthermore, the total amount and proportion of tropospheric ozone in this region exhibit a spatial pattern of higher values in the south and lower values in the north, combined with a seasonal difference characterized by higher values in summer(12.24%) and lower values in winter(8.67%).