The 15449S comprehensive mining face of Jiulong Mine is located in the north five mining area of the mine, the mining conditions in this area were complex, the main difference between the mining stress of this face and the ordinary coal mining face was the roof, because the hard roof was not easy to break, the cycle pressure was strong, and it was on high bearing water, the mining stress change pattern was not obvious. The minimum pressure time interval was 3 d and the maximum was 36 d, and the minimum pressure step interval was 2.85 m and the maximum was 17.4 m. The pressure time and step interval were irregular and difficult to predict accurately. By analyzing the relationship between the water level and mineral pressure in the observation hole of the working face during the recovery period of 15449S working face, the changing law between mineral pressure and water pressure was found out, which provided successful experience for the early warning of incoming pressure and safe recovery of the roof of the working face in the future.