Abstract: The hole sealing technology is an important part for mining engineering of mine gas extraction, lax sealing and air leakage is easy to cause short circuit of drainage, low negative pressure of drilling orifices and low concentration, which directly affect the gas drainage effect. In Hegang Mining Area, affected by pressure relief zone cracks in roadway and the fractures of drilling pressure relief ring, fractures in the proximal end of the orifice are developed; adopting conventional drilling sealing technology, air tightness is poor and air leakage is obvious. In order to improve the situation, Hegang Mining Company carries out a comprehensive gas drainage technology research, uses “two-sealing and one-grouting” hole sealing technology with pressure to solve the problem of air leakage of gas drainage, and the negative pressure of drainage orifice is improved and the gas drainage concentration is increased.