Abstract: In this paper, a hybrid modeling method using Earth Volumetric Studio (EVS) is proposed in order to resolve the problem of the EVS program could not divide the sequence of karst rock cavities when using the stratigraphic modeling method alone in a karst terrain. The lithology modeling method alone, it could not clearly reflect the defects at the interface relationship among the layers. Throughout analyzing the principles of the Kriging Method in the geostatistics, the proposed hybrid modeling method can not only present the interlayer interface relationship of geology, but also model the karst rock cavities. Based on data measured in 58 boreholes in a college bridge site area of Yangshuo County, Guilin, a hybrid modeling method was used to conduct a three-dimensional geological modeling study on the geologic conditions of the project site. The original lithology modeling method was compared and analyzed. Both the hybrid model and the lithology model were cross validated, which showed that the theoretical accuracy of the proposed hybrid model was better. The three-dimensional geological model established by this method can be used to predict the problems encountered in the pile installation.