Abstract: On 5 Nov. 1995,a huge water gushing hazard with the flow of 4257 m³/h occurred in Xin'an coal mine and themine was flooded. After investigating, the passage is F₃ normal fault, the source is from middle Ordovician limestone water.The passage was plugged by grouting method. remnant flow is only 29.55 m³/h. The control result is satisfactry.