Abstract: In view of the hidden danger of water disaster caused by the closed pit to the adjacent production mines, in order to ensure the production safety of the adjacent mines after the closed pit in Zhaogezhuang mine, the evolution process of groundwater flow field in closed pit mine area is studied by numerical simulation method, and the concepts of safe water level and warning water level are put forward：After the mine is closed, the underground water level rises slowly, the water level depression funnel in the aquifer decreases gradually, and the speed of water level recovery slows down with the increase of mine closure time. After three years, the water level in the mine reaches the safe water level of - 570m；In order to ensure the safety production of Linxi mine, according to the recovery of water level and the damage of mine boundary, the warning water level of - 575M is determined，when it is considered that the water level in Zhaogezhuang mine is always lower than the warning level by using the drainage of Linxi mine, the increased drainage of Linxi mine is about 12.5m3/min. The results provide basis and reference for the prevention and control of old air water in adjacent mines.