Abstract：The research methods of percolation in 3D porous media are presented. Based on VC++6.0，the software to simulate percolation is developed. The 3D percolation mechanism in porous media，the characteristics of percolation cluster by numerical simulation method，and the theory of renormalization are studied. The effective surface area rate is proposed.，and the achieved results indicate：(1) the number of cluster increases with the increasing porosity in the beginning and decreases at a later time when the value of porosity is 0.20，and the number of cluster has the maximum value；(2) with the increasing of porosity，the surface area of the largest cluster increases，and the value fleetness increases as the value of porosity is larger than percolation threshold；and (3) when porosity is 0.55，the surface area of the largest cluster reaches the maximum value，and the value of effective surface area rate is 0.98. When the value of porosity is 0.311 6，the percolation cluster is a random fractal and the fractal dimension can be deemed as D = 2.934.
