Abstract: The 311101 first mining face in Bayangaole Coal Mine is taken as the example. Before mining in the working face, geophysical exploration project combining transient electromagnetic method with audio frequency electric perspective method are used to detect the abnormal water-rich area of the coal seam roof. Then the drilling project is arranged to dredge roof water and master the distribution of water inflow and water pressure. Based on the results of geophysical exploration and drilling engineering, the water-rich area on the roof of the working face is determined and divided. The results show that six abnormal water-rich areas are detected in the roof geophysical exploration project, and the water inflow and water pressure of the fifty-six roof water drainage boreholes are divided into four numerical intervals. After comprehensive analysis, the roof water-rich area of the working face is divided into four parts; in the mining process of the working face, it is obvious that the stepped increase will appear for the water inflow of the working face for every water-rich area. This phenomenon verifies the rationality and accuracy of water-rich partition of the roof aquifers.