For selecting the practically reasonable seepage parameter of fractured rock slope, this paper analyses the permeability coefficients obtained from the pumpin test and fissure sample measuring method, and proposes to use the result of single hole pumpin test to modify the tensor obtained by fissure sample measurement method. The result indicates that this method can better depict the anisotropism of permeability characteristics of fractured rock mass and the modified permeability tensor can eliminate the? nonpenetrability of fissures and fills and the size effect of the pumpin test. The proposed method was then used in the simulation calculation of seepage field of rock slope of some road in Henan Province.