Abstract: Based on a review of previous work on the textures, microstructures, and origin of fault rocks, this paper gives some new interpretations and suggestions on the classifications of fault rocks and faulting model as following. (1) Fault rocks formed at some specific tectonic regions and provided a record of the nature of deformation. So, it is generally believed that the regional tectonic history can be understood by studying the textures of fault rocks. (2)The textures such as lineations and foliations found in fault rocks not only formed in ductile shear zone, but also formed in brittle shear zone. Therefore, the lineations and foliations can not be used as an only criterion in the classification of fault rocks. (3) The original grain size of crystals included in host rocks must be considered in the classification of fault rocks and the deduction of deformational degree of fault rocks from the grains size, because the original grain size of crystals included in host rocks affects the changes of grain size in fault rocks. (4) It is possible to understand the formation mechanism of fault rocks and related seismic faulting, and to build a relative fault model by studying the mechanical mechanism of fault rocks and related subjects such as seismology, tectonics, rheology and mechanics of materials.