Abstract: Electrochemical impedance method is used to explore the changes of scaling process in geothermal water solution and metal surface under the intervention of external weak electric field. The experimental results show that the intervention of the external electric field can effectively reduce the degree of scaling on the metal surface and maintain the electrochemical characteristics of the metal itself for a long time; at the same time, the change of the liquid-phase scaling process under electric field intervention will also further reduce the risk of migrating and depositing scale on the metal surface.