Abstract: The Resistivity Tomography method is based on ordinary to collect the high-density data and then to form a high-density and rich-content resistively section.It can reflect the basic characteristics of geologic body objectively and exactly through the analysis and processing of the geoelectric data.This paper makes a brief overview on the resistivity tomography of principle,method and mechanism of the formation of cave.The detection and discovery of the cave at Xihuling Scenic Area in Lushi county,that has great significance and value for the development of this place.Using resistively tomography method can make the explanation work more convenient and intuitive,and has good relevance,effectiveness and feasibility.