Based on outburst coal seam in Dashe Mine, through technical innovation and construction on site, new drilling equipment to construct below-oblique drilling was instead of no equipment to construct under this situation. Two plugging and one injection sealing hole technology was adopted to solve the cement squeeze thick liquid cannot be used in below-oblique drilling construction, which ensured depth of the hole sealing, improved gas extraction effect and mining working face gas comprehensive extraction and provided conditions for safe production.