Based on hard drainage of low-permeability coal seam, the regular gas drilling was unreasonable, the gas permeability of coal seam was analyzed, low-permeability high gas coal seam hydraulic power enhanced gas drainage technology was discussed.Some mine was taken as example, fracture hole of No.1 and No.2 were conducted by hydraulic intensification extraction,the drainage volume rose from 8L/min to 78.8 L/min and 14 L/min to 80.5 L/min separately,the technology improved gas drainage obviously.