annual maximum peak-valley difference and annual average peak-valley difference of Hunan power grid. The difference of Hunan power grid load rate between summer and winter is researched according the power load structure. Finally
the influence factors of Hunan power grid load rate are analyzed. The result shows that annual load rate of Hunan power grid is decreasing
and the peak-valley difference is increasing year by year. It is urgent to strengthen demand side management and do well peak load shifting of Hunan power grid.