Gas pre-pumping has been a bottleneck of gas control work, in order to solve this problem, hydrofracture permeability improvement technology was proposed, the principle of hydrofracture permeability improvement technology was proposed, hydraulic fracturing and drilling equipment layout process were analyzed. A group hydrofracture permeability improvement technology test was carried out in the bottom of roadway 32321 of Panyi Mine.Tests showed that fracturing drilling drainage area was twice the radius of the original coal, pre-hole gas pumping pure amount was 3.5 times than original coal, pre-drainage standard time by 51.6%, fracture propensity effective radius up to 50 m, up to 70m on strike, after fracturing extraction radius to 12 m, tendency on 10 m, increased 1 times than the original drainage radius 5 m.