In the paper, the annually and monthly mean temperature series of the whole China is shown based on the analysis of the monthly mean temperature at 716 stations in China about 2.2×105 data from 1921-1990. The climatic variations of the mean temperature series are discussed The . results show that from 40's to 60's,the mean temperature of the whole China was falling more obviously than that of the northern hemisphere, but in 80' s the temperature in northern hemisphere was going much higher than that in China