Xingdong Mine of Jizhong Energy Corporation Ltd. with large mining depth, -980 level downhill goaf mining depth 1 200 m, complex geological condition, multiple fault and structure, large surrounding rock pressure, difficult roadway support and maintenance, deep mining area water drainage system was set under working face goaf, surrounding rock deformation of its goaf floor stress lowering area was under control by adopting numerical simulation, which ensured the safe working of water drainage system and provided reference for deep mining large section pump chamber arrangement.