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By using the daily maximum electric power load data from the the Southern Hebei Electric Power Company from 2007 to 2009, the variation regularity of the daily maximum power load in summer (May to August) over the southern Hebei Province is studied. By means of the standardized and correlation analysis, the correlation between maximum power load and month by month meteorological factors is analyzed, and the weekly variation characteristics of maximum power load, as well as the variation of maximum power load during holidays,are discussed.In addition,in combination with the growth characteristics of crops in the southern Hebei Province, the variation characteristics of maximum power load of the Southern Hebei Electric Power Network are studied, which are useful to the forecasting of maximum electric power load.