Abstract: The monthly mean temperature at 137 stations in China in present century are classified into five grades 1-5.Maps of grade distribution have been prepared for every month and year. According to the intensity of cold or warm areas, the monthly temperature grade distribution is classified into 5 types: cold (C), warm (W), sub-cold (Cw), sub-warm (Wc) and normal (N). For every month, mean grades are computed for seven regions: northeast China; north China; middle and lower Yangtze; south China; southwest China; northwest China;Xinjiang.Based on the above materials statistical anaysis of the occurences and secular variation of five types are made and associations among the regions are studied. The characteristics of temperature variation of last thirty years are discussed. These results are useful for understanding the climatic change in China and may serve as background for long-range forecasting.