Abstract: According to the instance of water inrush and treatment of 912 working face in Dongpo Coal Mine, this paper summarized the technology of rapid treatment on water inrush from mining coal of fully mechanized caving face, and analyzed the water inrush resource and channels of 912 working face, studied the mechanism and characteristics of water inrush from the coal, designed the project of grouting and blocking water, and realized crossing fault recovery of working face. The research showed that the working face can be reproduced quickly and crossing through the fault zone safely by firstly exploring the water inrush resource and tunnel after the water inrush from the coal seam in fully mechanized caving face, and then sealing off the water inrush tunnel by using the two-fluid slurry to grout the fault zone according to the characteristics of unexposed fault zone and little water discharge through laying the grouting holes from far to near to finally reinforce the fault zone.