Using the radio sounding data during 1998～2007, the distribution characteristics of annual and seasonal mean temperature, relative humidity of upper air of the five areas in China were analyzed for 13 heights. The results show that the trends of annual mean temperature and relative humidity of upper air of the five areas in China in daytime are similar to the trends at night as the height increasing. The annual mean temperature of the five areas drops with height up to 100 hPa, where they reach the minimum, then increase with height. The annual mean relative humidity of the five areas drops with the height. Annual mean temperature and relative humidity show obvious difference between the south and north of China. As the height increase, the trends of seasonal mean temperature and relative humidity are similar to annual mean, especially the trends of autumn.