The process of element extraction depends on the action of the direct current field. The continuous action of the direct current field leads to the variation of pHvalues of soil media. When such variation reaches a certain degree, it will unfavorably affect the electric extraction process. Therefore, the relationship between them is a subject which ought to be dealt with in future. Based on experimental data obtained, this paper has revealed the intensity and range of pHvariation in soil media around the element extractor in the process of electric extraction, thus providing preliminary data for the study of the above problem.