Abstract: Using the daily global data sets of temperature,pressure and geopotential height from 1948 to 2006,the global potential temperature and geopotential height at tropopause are calculated.The results show that the global potential temperature varys from 310 K to 380 K,maximal temperature occurs in subtropic and minimal appears in polar region.The spatial scale of potential temperature over land is small-scale and that over oceans is large-scale.From 1948 to 2006,tropopause potential temperature generally decreases in continental regions,rises in marine area, and from June to August,potential temperature declines significantly in Qinghai-Tibet Plateau and the east of the continental regions and the Antarctic,from December to February of following year it rises significantly at 30°S near the southern Indian Ocean and the South Pacific.The global tropopause height varys from 10 km to 17 km, maximal height occurs in subtropic and minimal appears in polar region. Tropopause geopotential height synchronously rises and decreases in the two hemispheres.Quasi-half-year phase differences exist between two hemispheres.The tropopause mostly show an upward trend in tropical and a downward trend in ploar.Geopotential height generally decreases in continental regions, rises in marine area at tropopause.