Geothermal fields in Gui'an of Fujian Province are mainly controlled by faults. Using one-dimensional inversion results and CSAMT method, the authors simulated the spring when the upwelling spring water surface was distributed at different depths to study the distribution pattern of the faults, and found the spatial distribution of faults and the relationship between various faults in the study area, and the effectiveness of the result was proved by drilling. The result shows that this means is effective in looking for fault structure.