Abstract: In the process of geoelectric observation, the data are easily disturbed by by leakage and observation system fault, such as sudden jump, step, out-of-tolerance and so on. These interference data is difficult to judged quickly, and need a lot of inspection work to complete. The instrument can record the working state and the change of the geoelectric field in real time. When there is interference, the second data or minute data of the corresponding interference period can be retrieved, and the interference can be identified through numerical analysis, thus eliminating the abnormality and improving the efficiency of interference data troubleshooting.