Based upon the fine interpretations of 3D seismic in Tazhong low uplift, four series of fault systems are classified: (1)Cambrian-early Ordovician tensional fault systems whose distribution, configuration and development scales establish the foundation of the consequent structural activities; (2)late Ordovician thrust fault systems and northwestward slip fault systems whose structural characteristics vary in different zones and fragments: thrust fault system develops in the east, and northwestward slip fault system develops in the middle-west; (3)Silurian-Devonian northeastward slip fault systems formed in extrusion stress background and spread northeastward, which are made up of three parts: the main faults, the tailed en-echelon structures and the fault troughs; (4) the fault system related to Permian magmatic pierces, which distributes spottily or in bands, and are mostly developed along earlier faults and always superimpose or reform earlier faults. In plane, the Tazhong Paleozoic fault systems are a tensional-shear broom-like structure with sinistral internal rotation layers pointing to the divergent termination.