Abstract: Underground drilling hydraulic fracturing as a kind of increasing permeability effective extraction technology for single low gas permeability coal seam has the widespread application, but confined to the underground space and equipment ability, it is difficult to achieve large displacement or add proppant fracturing; crack is not uniform and easy to closing. hydraulic pressure burst increasing permeability extraction technology is proposed in this paper. The technology, taking "cell increasing permeability fracture network, the coal unloading single-hole increasing permeability" as the main thought, "pressure" inside the control unit makes the unit within the cracks open, extension, connection, and form a "crack" for the first time, on the basis of the "cracks" after "blunt", it forms a uniform "net" slot and the coal unloading further, which avoids single pressure unevenness, increases the single shot landings, helps to form extraction in the unit "stereo net". Hydraulic pressure burst test shows that unit extraction from scalar is 10.6 times that of the conventional extraction from drilling, hydraulic fracturing of 12 times, 2.78 times that of the hydraulic punching.