Abstract: This paper presents the geologic environment condition and the 4 construction stages of lightening prevention ground-network and the earthing resistances in the 7 well-stations of the groundwater observation network in the Jinshajiang reservoir area, and factors influencing earthing resistances are analysed. It is found that the crucial influencing factor of earthing restance is the geologic environment condition in the well area,and the effective way of reducing earthing resistance is increasing the network dimension and the depth of angle steel poles, and there are some effect of reducing resistance while applying reducing resistance agent and adding water-pond for reducing resistance rationally.

Key words: Lightening prevention ground-network, Earthing resistance, Groundwater observation network in Jinshajiang reservoir area