As the first mining face of No.202 panel in Dahaize Coal Mine, the hydrogeological conditions of No.20201 Face are very important for water prevention and control. Based on the hydrogeological data of the mine, this paper analyzed the characteristics of the aquifer and aquiclude of No.20201 Face and the law of groundwater recharge, runoff and excretion, and focused on the evaluation of the development height of water conduction fracture zone of the roof of the working face and its influence on the water filling source. The research results showed that the average development height of water conduction fracture zone of No.2 coal roof of No.20201 Face was 142.7 m, which mainly communicated the sandstone fracture aquifer of the Jurassic Zhiluo Formation. The water abundance was weak-medium and unevenly distributed, which was the main source of mine water filling. During the mining process of the working face, the roof water disaster was the main prevention and control object, and it was necessary to focus on the communication effect of the water conduction fracture zone on the aquifer of the Zhiluo Formation. This study provided a scientific basis for the design of water prevention and control engineering in No.20201 Face, which was of great significance to ensure the safety of mine production.