Abstract: In order to solve the problem of strong water inrush at 400 m of the No.8 coal seam 28620 transportation channel in Zhenchengdi Mine, theoretical analysis and on-site drilling observation methods were used to analyze and determine the water source of the inrush.Based on the characteristics of the water inrush channel, a water hazard control plan was adopted, which first sealed the water inrush channel with nitrogen and then sealed the hole with grouting, and on-site practice was carried out.The results show that under the action of the new technology of nitrogen sealing grouting hole sealing, the water inflow in the tunnel has been effectively controlled.The nitrogen sealing grouting hole sealing scheme is designed reasonably, which can effectively treat the water damage problem in the tunnel and ensure the smooth excavation of the 28620 transportation channel and the safety of construction personnel.