Bulk granules and pores exhibit irregularity, self-similarity fuzziness and non-linearity. And further, the overall structure seems very complicated. A disorderly seepage system is formed as the flowing body undergoes random movement in the bulk system. Using the renormalization group method, a two-dimensional seepage model is established and the generating process of the seepage in the porous bulk media is analyzed. The fractal behavior of the bulk seepage is analyzed using fractal geometry and is simulated with computer.