Resources integrated mine lower coal seam threatened by upper coal seam goaf water in mining, affecting the safe mining. No.11 coal seam of No.1 mining face 2101 working face Shanxi Lu’an Puxian Yitian Mining Industry Corporation Ltd. was taken as example, ground and underground transient electromagnetic exploration was adopted to settle the No. 2 coal seam goaf water scope up working face, with drilling discharge, effectively solved the safe and effective mining of lower coal seam and provided experience and reference for goaf water discharge under similar condition.