Abstract: A lightning eliminating device for reducing the possibility of thunder strokes comprises a supporting base used for fitting semi-conductor rods, and a plural of semi-conductor rods fitted outwardly on the said base and having an elevation-angle or parallel with the ground reference, the two adjacent semi-conductor rods being electrically connected at the ends and separating from each other at the other ends at such a distance as will not cause a break-down voltage greater than the surface-wise flashover voltage generated on a single semi-conductor rod by thunder clouds. The semi-conductor rods may be made of the single variety of resistance material having a proper mechanical strength, or epoxy resin bars coated with semi-conducting materials such as zinc oxide, carbon black and resin. Even when there is a thunder stroke, the lightning eliminator will emasculate a strong stroke and reduce thunder current passing into the ground by 99%.