Interlayer hydraulic fracturing fault, which associated with the fluid activity of wide scope in the depth of sedimentary basins, have been confirmed to develop largely in the Mesozoic and Cenozoic sedimentary basins through the methods of geophysics and drolling sampling. The studies in this paper indicate that large-scale interlayer hydrofracturing clastic rocks, which formed in folded Late Paleozoic rift basin, are the geological trace of fluid face zone and its hydrofracturing in the developing process of sedimentary basins. Author studies its geological feature, forming condition and structure fluid dynamics model, and realizes that the studies above have vital important geological significance in the bed seperation of upper crust, nappe, fluid conductivity, polytype mineralization, oil gas movement, slow earthquake and conventional earthquake, etc.