Abstract: Drilling cuttings backfill hole sealing technology is a kind of sealing technology using coal powder and cement and proper additives according to a certain proportion and through two plugging and one grouting bag-type hole packer to carry out grouting. To take advantage of coal dust generated during drilling, we use the way of sealing coal with coal to improve the sealing effect and then improve the effect of gas extraction. We use the method of combined laboratory experiments with underground trials to analyze the reliability of material and effect of the coal powder hole sealing technology. The results show that the coal powder hole sealing technology greatly improves sealing effect than traditional technology, the average concentration of single hole is increased by about 70% and also greatly saves the sealing materials, the single hole cost is reduced about 50%.