Abstract:Abstract: An in-depth research to analyze the process of triggering counting signal about Lightning Event Counters(LECs) is presented to deal with the problem that LECs based on double exponential waveform usually register with high records,then a notion that high-current-peak M component and multiple oscillation during one return stroke are the main factors leading to count error is proposed. Through vast comparative analysis on return stroke measuring data of triggered and natural lightning flashes, characteristic parameters as lightning wave-head gradient,effective pulse length, ineffective pulse length and pulse duration are extracted. Since gradient detection method can distinguish return stroke that meeting judging condition, the monostable flip-flops generates only count within one return stroke symbol period. Circuit simulation shows that the above methods can restrain the noises of high-current-peak M component and redundancy signals created by multiple oscillation during one return stroke,also enable LECs to improve valid triggering count signal identification precision.