Based on former geological data and hydrogeological feature of Qianchang Mine, analogue method and analytical method were used to predict mine inflow. The results showed that major aquifer water in research area was weak to moderate, and it was in a bad condition of groundwater recharge. But water of karst fissure aquifer was strong and potential safety hazard existed in underground watercourse of fault zone. Normal water inflow in deep mining was 520 m3 / h, and maximum water emission was 662 m3 / h.