Abstract: When the traditional single point power supply electrode DC advance detection technology is used to detect the long-distance anomaly, the signal gradually weakens and the accuracy greatly decreases with the increase of detection distance. In order to solve the problem of large error in long distance advance detection, we combine the existing DC method advance detection technology to change the power supply from single point source to three-point source, use COMSOL software to simulate, draw the apparent resistivity curve of the survey line, and draw the apparent resistivity profile through SURFER. The results show that the three-point source power supply can better reflect the location of the remote abnormal body, increase the effective distance of advance detection, and improve the accuracy of advance detection.