Global Positioning System Radio Occultation (GPS RO) measurements are particularly suitable for the study of tropopause characteristics, due to their high measurement accuracy at the tropopause height.In this study, COSMIC (Constellation Observing System for Meteorology, Ionosphere and Climate) occultation data from 2007 to 2013 were used to calculate the tropopause heights over the Tibetan Plateau according to the WMO (1957) tropospheric height discriminant method, then radiosonde data were used to examine the results.In addition, the height characteristics of the troposphere over the Tibetan Plateau and the distribution of water vapor in the troposphere were analyzed.The results showed that there was a high linear correlation between the tropopause heights detected by the COSMIC occultation data and radiosonde data over the Tibetan Plateau.The correlation coefficient was as high as 0.976, average deviation was 0.448 km, and root mean square error was 0.672 km.Influenced by thermodynamic factors, the tropopause over the Tibet Plateau is highest in summer and lowest in winter and spring.From winter to summer, the position of the tropopause break area gradually moves northward.In spring, winter and autumn, affected by the equatorial heat source, the entropy surface from low to high latitude rises, with the water vapor mixing ratio decreasing gradually in the middle and lower troposphere.In summer, under the effect of the deep convection caused by the heat source and horizontal transport caused by the monsoon, a high value area of water vapor appears over the Qinghai Tibet Plateau.