Abstract: In order to ensure the safe excavation, the characteristics of aquifer development, water abundance, roof aquiclude and water conducted fractured zone were studied based on the geological and hydrological data, borehole data, and transient electromagnetic prospecting results in Dananhu No.7 coal mine. Considered the influence of the upper aquifer and gob water comprehensively, we evaluate the risk of water inrush in No.10 coal and propose preventive measures in the first mining area. The research shows that the direct water-filled aquifer of No.10 coal mining is No.7 to No.10 coal aquifers which thickness is 0~62.3 m decreasing N to S. Transient electromagnetic survey delineated five relatively water-rich areas located in the northwestern and southern border areas of the first mining area. The roof aquiclude possesses better water resistant capacity in the north than whose in the south. During the No.10 coal mining, the height of the water conducted fractured zone is 19.47 to 29.98 m, which increases gradually from SW to NE. According to the risk evaluation of roof water inrush in No.10 coal mining, it is seriously threatened by the goaf water of 7^# coal in the southern first mining area, while the strong water-richness of direct water-filled aquifer in the western and northern parts. Therefore, some relevant measures of water detection and waterproofing should be taken in advance.