A method and system for forming ground electrodes are provided, the method includes: metal conductors are laid in grooves that are dug out on a ground surface; conductive solution is prepared, with the conductive solution consisting of 0.1%-0.5% of amylocellulose, 15%-24.9% of high conductivity carbon powders, 15%-24.9% of gel material, and 60%-70% of water, by weight percentage; and the conductive solution is poured into the grooves, wherein the conductive solution forms conductive gel after solidifying, which wraps up a part of the metal conductor contained in the groove. The system for forming grounding electrodes includes: an excavating equipment, a setup equipment, a solution preparation equipment and a pouring and molding equipment. The method and system for forming ground electrodes can make the discharging effect of lightning currents better.