Abstract:After the extreme freezing catastrophe in year 2008, Guizhou Province experienced another rare freezing weather at the beginning of 2011. Analysis based on the conventional observational data as well as the NCEP reanalysis data indicates that the Ural blocking high and the height departure distribution of “negative in the south and positive in the north” are the key causes for the maintenance of low temperature. Meanwhile, the quasi stationary front in Guizhou and Yunnan plays an important role during the freezing days; the deep trough over Indian Ocean and abundant water vapor are very favorable to the vast area stricken by snow and freezing rain. The extent of calamity is weaker than that of 2008, especially in the eastern Guizhou, as it lacks for the continuous transportation of moisture. The route of cold air mass is also different from 2008. Moreover, the two strong processes are discussed, and they have different configuration in T logp diagram. In addition, research on the relation among the maximum frozen rain diameter, the daily average surface temperature, lowest temperature, daily total rainfall, the daily mean surface velocity, and the daily average temperature shows a better correlation with freezing development when there has compatible precipitation.