Abstract: According to the scale and the permeability,the fractures and pores in rock mass are divided into four levels,i.e.,the level-1 real fracture network,the level-2 random fracture network,the level-3 equivalent continuum and the level-4 continuum.The seepage model for rock mass of multi-level fracture network is proposed by combining the fracture networks of four levels,in which the water balance is sustained.A engineering example is also given to show the applicability of the proposed model.