Based on the indoor two-dimensional sandbox DNAPL remediation experiment, the changes of DNAPL were monitored by the imaging method and the resistivity imaging method to evaluate the effectiveness and feasibility of the resistivity imaging method for monitoring. The results showed that: In the DNAPL infiltration experiment, both the resistivity imaging method and the imaging method could reflect that the DNAPL infiltration was mainly vertical and was mainly affected by gravity. Through the spatial moment analysis of the saturations obtained by the two methods, it was found that the trends of the horizontal centroids of the two methods were quite different, while the trends of the changes in the vertical centroid positions were basically the same. In the DNAPL remediation experiment, with the injection of the SDS solution, the relative resistivity value at the center of the DNAPL pollutant decreased from 25 Ω·m to - 10 Ω·m, and the saturation decreased from 0.42 to 0.15. When the correlation analysis was carried out at specific positions in the sandbox, the correlations between resistivity and saturation were 0.72, 0.84, and 0.92 respectively, and the correlation coefficients were all greater than 0.6, indicating that the two monitoring methods had consistency in interpreting the remediation process. By comparing the monitoring effects of the two methods on the DNAPL infiltration and remediation processes, it was found that during the infiltration process, the imaging method had a better monitoring effect. The imaging method could provide high - precision infiltration images and had a meticulous ability to capture the dynamic changes of DNAPL. During the remediation process, the resistivity imaging method had a better effect. The resistivity imaging could penetrate the medium to monitor the diffusion of the surfactant in different layers and spaces and obtain the macroscopic distribution trend.