Abstract: For the problem that about a half of gas extraction holes are failed due to disturbance influence during rock and coal roadway blasting driving in the Duanshi Mine, the ability of drainage reduces much, and the extraction and driving is seriously imbalance, the reasons of hole failure are gotten based on the change laws about extraction parameters, which are that the bedding holes are failed because of deep coal body collapsing, and through beds holes are failed because of loose leakage of rock mass and sealing section. It is determined that bedding holes use technology of screen pipe putting down along full length borehole, and the through beds holes use a three-step retreatment measure which is “breaking hole, drilling hole, stepwise sealing”. The application shows that the extraction scalar average of bedding holes and through beds holes increased by 13% and 20% after blasting in investigation period when the failed holes use protected technology, the time of extraction extends at least one month, and the extraction reach standard time is shortened sharply and rate of the area outburst elimination is increased from 45% to over 90%.