In this study, we analyze the natural and anthropogenic interference on geoelectric observations in Shandong based on data tracking and analysis of the geoelectric observation data. Results show that(1) when the observation system receives strong interference, the observation data is synchronized with noise or missed entirely; this was easier to distinguish.(2) The geoelectric observation data is strongly distorted by lightning; amplitude reaches tens(or even hundreds) kV/km. This phenomenon is observed several times.(3) Abrupt rainfall causes data inconsistencies. Above-average rainfall affects the normal diurnal variation form; the correlation coefficient, between the geoelectric data and the diurnal cycle, is reduced from 0.8 to 0.6, or even lower.(4) The HVDC effect is significant. When the current is injected, the output is significantly higher. When the injected current falls to zero, the output is a straight line.(5) Human interference produces data discontinuities and changes in long and short-distance reception. However, the same measurement channel is almost the same.(6) The results of six tests on the variation of geoelectric storm produce consistent results; the maximal amplitude direction is the same in all cases, despite the fact that the different circumstances were expected to produce different amplitudes.