Abstract: Through the test of high pressure capsule grouting sealing hole technology, on the basis of determining the grouting liquid formulations, the problems of poor sealing quality, bad drainage results of traditional polyurethane sealing are solved better. The test results show that high pressure capsule grouting sealing hole method makes the surrounding fracture to get well filling, eliminate the leakage path of opening, and make the drilling to get reliable support, ensure the borehole stability, make the surrounding does not produce new gas leakage path. After 90 days of test drilling drainage, the average drainage concentration still reaches 33%, the effect is obvious.