Abstract: In the electrical exploration, the abnormal response of the geological body may have some problems such as weak signal, not evident feature or fuzzy contour. These affect the correctness and accuracy of the geological interpretation. In this paper, solving the first or secondary derivative to the abnormal response contour along the direction of the gradient direction and using gradient operator or Laplace operator are applied to enhance the feature of abnormal response. The result of numerical forward modeling shows that this algorithm can make the abnormal center of the abnormal response contour more definite, the range of contour clearer, it proves that these methods have a positive effect on the correctness and accuracy of geological interpretation.