In order to graspe the distribution of rock joint and to construct the jointed rock mass model, we have carried out the borehole survey through the Borehole Scanner System and have analyzed the image data so as to obtain a location, orientation, aperture etc. of rock joint. Based on the analyzed joint data, we have constrcuted two kinds of jointed rock mass model; namely a discontinuous model and an equivalent continuous model. The former is based on the cluster analysis in addtion to the relative importance which is our concept and considers of joint frequency, joint area, joint aperture. The latter consists of the joint frequency map which considers of geological structure and joint aperture and takes an advantage of not only the mechanical numerical simulation but also the application of geotomography analysis.