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Using the lightning data from 2004 to 2007 from the Jiangxi Province Lightning Monitoring and Positioning System, an analysis is made of the distributional characteristics of lightning intensity and steepness in Jiangxi Province, as well as the correlative coefficient between them. According to the related lightning protection criterions for building structure design (5005794), some thunder and lightning parameters and the formulas for calculating the safe distance are discussed. The analysis indicates that there is remarkable difference between the annual mean density of lightning strikes calculated from the measurements and from the observed number of thunderstorm days.