Abstract：Fractured rock mass has obvious anisotropic feature，which is often treated as equivalent discontinuous medium，equivalent continuous medium or doubling continuous medium of pore-fissure. The seepage parameters of rock mass are quantized form of permeability，and also are the basis to solve seepage field of continuous medium. Based on the attribute of fractured rock mass and by taking engineering design into account，fractured rock mass is often considered to be anisotropic continuous medium，and the symmetry of permeability tensor is the symbol of continuous medium. Every type of textbook lacks of the symmetry certification，but uses the conclusion directly. For the sake of comprehending the essence of the permeability tensor further，the symmetry of the permeability tensor of fractured rock mass with single fissure，single set of fissure or multiunit fissure is proved to illuminate the relationship between percolation gradient and the permeating flow rate，and then the dominating equation of seepage flow is derived.
