Based on the 2012—2016 lightning location data recorded by lightning location system

combing with the geographical and climatic features of Chenzhou area

it analyzes the area of lightning flash frequency of annual variation trend

monthly distribution and positive/negative CG changes. Using the grid method to draw up 2012—2016 flash density distribution map nearly 5 years of flash density distribution

it makes correlation analysis with transmission line lightning fault point distribution. Amplitude probability distribution function of flow of lightning in 2012—2016 years is of fit

and it makes comparing analysis of differences before and after the flood of lightning current amplitude probability distribution curves. It can provide reference to the calculation and the development of lightning protection measures of lightning protection at transmission line in Chenzhou power grid.