Lithology sounding technology of telluric electricity field is applied in geothermal exploration in Linqing city. It is used to know water-bearing condition in deep reservoir and fix geothermal well level, which have gained good result. Through results contrast between logging and drilling, it is regarded that this method can reflect depth and width of water-bearing layers, which can provide reliable basis for selecting well location. This technology can be used to survey depth and width of reservoir, fault structure location and occurrence regionally.