Abstract: Based on the different electrical resistivity characteristics between the slipped loess mass and the sliding loess bed of a landslide, the multi-purpose numerical direct-current electricity meter modeled WDJD-1 and the improved exploring electrode installment are used to measure the electrical resistivity values of losses masses above and below the sliding surface respectively. The tests are carried out in trenches and drill holes in theoriginal condition of loess stratum where landslide occurred. The test results show that the electronic resistivity test curves appear the phenomenon of exceptional jumping crossing the sliding zone. On the other hand, the change difference of the curves is not evident in the undisturbed loess stratum. This exceptionally change characteristic can be a characteristic signature to identify the sliding surface position in loess slopes. This survey method fully uses existing exploration engineering condition, it is simple in operation and can directly-observe test results. It has the potential for landslide investigation in loess slopes.