Abstract: The study methods for coal reservoir fissures are analyzed from the view point of coal petrology,and the definitions related to the fissures are presented. It is considered that the distribution direction of main fissure is the optimal direction of Permeability; the parameter of fissure geometry is the magnitude of permeability;and the connected fissure network is the better indication of high permeable area. Therefore, a simplified method is Presented for the prediction of coal reservoir permeability.