Abstract: For the deficiency of quantitative description of cross- hole remaining oil distribution at high water-cut stage,how to measure the potential around five injection wells in main oil pays of H3Ⅵoil group in Shuanghe oilfield within about 20 km by well-ground potential measurement method is presented.After the numerical simulation and the processing of 3D resistivity inversion imaging technique,the under- ground resistivity and the saturation distribution of remai- ning oil of the target strata are obtained.The onsite experi- ments demonstrate that the measured data are identical with the onsite experiment,which shows that the well-ground potential imaging technique is superior in the prevalent injec- tion direction,the remaining oil distribution and the evalua- tion of flooding effect.