Abstract: Daily data(0000GMT) of sea level pressures(Jan.-Feb.) from 1977 through 1986 in the north part of Australia are analyzed with EOF method. The Heat Low indexes are determined from the coefficient of the first eigenvector com-bining with daily data of 500hPa geopotential heights.It is interesting that there is a pronouneed correlation between the Heat Low and the severe cold damages in Guangdong. The forwer lasts about 5 days. There are eighteen Heat Low pro cesses in the twenty months. After each, a severe cold damage happened in Guangdong. The interval between the formation of the Heat Low(critical index below-2) and the beginning of the cold damage is about two weeks. The longer the heat low maintains the more the number of days in which Guangdong has cold temperature and prolonged rain.