Water outburst from coal seam roof is one of the common water disasters in mines. In order to study the water outburst risk of No.28806 Face in Dongqu Coal Mine, through the analysis of geological and hydrogeological conditions, the water pressure test was carried out by exploration drilling holes in the goaf. And combined with transient electromagnetic exploration, it was determined that the aquifer water of L1 limestone, K2 limestone and L4 limestone in the roof of No.8 coal seam was the main influencing water source, and the development height of roof water conduction fracture zone was determined. The results showed that the goaf water of No.2 and No.4 coal seams had little influence on No.28806 Face, the water abundance of K2 limestone and L4 limestone aquifer was weak, and there was no water outburst risk in the working face, which provided a reference for the safe mining of No.8 coal seam.