Abstract:The hydrogeological characteristic of water-conductive fault is a critical part of site selection and evaluation of high-level radioactive waste geological disposal system. Borehole radar measurement provides the useful information of geological features of extension in the rock mass. Acoustic borehole televiewer measurement provides the borehole-wall images in the degree of 360. The lithologic character,orientation and structural planes,and the relation between structural planes can be defined for studies of fault on the basis of borehole-wall images. Multi-parameter hydrochemical logging is a useful technique for identifying the vertical distribution of hydrochemical parameters in the deep environment. Injection test with double-packer can measure permeability coefficient of hydraulically conductive intervals intersecting boreholes. Data obtained from a single technique cannot provide a definitive and full estimation of hydrogeological properties of water-conductive fault. Integrated borehole measurement technique is the combined application of several techniques with integrated interpretation which not only exerts synergistic effect of borehole measurements but also improves the credibility of data in comparison of the results obtained by single measurement. An example is presented to perform the combined application of these techniques to characterize the hydraulic properties of water-conductive fault intersected by BS03 in the potential site,Beishan preselected area,Gansu Province for high-level radioactive waste geological disposal. Hydrogeological model of water-conductive fault is established.