Analysis of Drought Evolvement Characteristics Based on Standardized Precipitation Index in the Huaihe River Basin

Using the precipitation data of 35 meteorological stations in Huaihe River Basin, SPI is applied to analyze annual drought index of nearly 50 years (1961-2010). The results show that the frequency of drought in Huaihe River Basin reduced and the intensity of drought increased at the beginning of 21st Century, but drought areas decreased; main drought type is mild-medium drought, severe drought rarely occurred; in the current situation of climate change, the negative impact of drought on agricultural production will be lowered in Huaihe River Basin.