The equipment damages and life safety caused by counterattack of ground potential rise（GPR） are worthy of attention. Based on the experiment of artificial triggered lightning

the test model of common ground network is laid out. During experiments

the lightning current is injected into the model from the drainage rod and the GPR is measured. For comparison

different characteristics of GPR caused by return stroke and M-component are analyzed. It is summarized that the average time of 10%

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0% rising edge of the trigged lightning（T201514）’s 7 return strokes and 16 M-components is 0.4 μs and 279.7 μs

respectively

and the average time of the half peak width is 14.8 μs and 434.7 μs

respectively. The average time of 10%

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0% rising edge and the half peak width of GPR waves compared with the return strokes are larger

and the parameters of return strokes the proportion coefficients are 14.0 and 2.7

respectively. However

for M-components

the parameters between voltage and currents are similar and the corresponding proportion coefficients of them are 0.8 and 1.1

respectively. The peak value of the triggered lightning’s 7 return strokes and 16 M-components are –19.1 k A and –1.3k A

respectively

and they fit well with the voltages. The equivalent impulse earthed resistance can be got by dividing the peak voltage by peak current

the equivalent resistances of return strokes are obviously smaller than those of M-components.