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A new tool has been developed for the evaluation of the lightning performance of overhead transmission lines. The tool can take into account actual ground flash density distribution along line corridor, cumulative probability function of the lightning current, geometric parameters, insulator string configuration and the topography for each tower of the entire line, etc. Moreover, the tool incorporates several lightning attachment models and a method of ATP-based automated simulation for lightning surge analysis. An application to a typical 500 kV double circuit line of the Chinese transmission system shows that it is convenient for estimating the lightning performance of a total line and studying the effects of different models and criteria on the lightning performance of the line.