Normal>Fault zone is a three-dimensional geologic body, of which width, height and length have a positive correlation with fault displacement. Fault zone has a typical binary structure: it consists of fault core and damage zone. Fault core is made up of diverse types of fault rocks and later-stage cementing materials. Fault core is characteristic of poorly sorted, higher clay concentration, small particle and lower porosity and permeability than those of the surrounding rocks. Comparing with surrounding rock, the damage zone is developed with abundant fractures, and as the distance away from fault core increases, the density of fractures is progressively decreasing. And porosity and permeability of the damage zone is higher than those of the surrounding rock.