Abstract：It was aimed to enhance core methodologies required in establishing a hydrogeological site descriptive model using discrete fracture network(DFN). Well-constructed site-specific hydrogeological model should be essentially required in designing and constructing a water-drainage as well as a waterproof system of subsea tunnels. In the present work，based on the borehole investigation results in a crystalline rock，HydroDFN model was constructed by identifying water conducting features(WCF) from the observed fractures and through an intensive conditioning work for WCF parameters. Equivalent block permeability was calculated from the HydroDFN；and the calculated block permeability was compared and analyzed with the in-situ measured data of permeability in the borehole.
