Abstract: Crossing Fushanzhai fault is a complicated system engineering for Peigou Coal Mine. On the basis of analyzing geological structure and hydrogeological conditions of crossing fault region, combined the ground and underground, geophysical exploration and drilling, plugging fault zone and plugging source, fault development and hydrogeology features are explored. Using pre-grouting reinforcement to strengthen the fault zone, the roof and floor aquifer, it ensures 42 diphead to safely cross Fushanzhai fault.