Abstract: In order to solve high water inrush from the floor of the No.2 Auxiliary Transportation Roadway in Longgu Mine, a physical exploration technology combin ed with the mine transient electromagnetism and geological radar was applied to determinate the watery zone in the roof or floor of the mine roadway.A water control pl an with shallow and deep section grouting as well as the local drainage and sealing was set up.The borehole layout was optimized.There were 52 boreholes of deep gro uting and water sealing completed.The water inrush quantity from the mine roadway was reduced from 720 m3/h to 340 m3/h and there was no heavy raining from roof.