Abstract:Pengshan water source exploited loose rock pore water and fissure karst water. It is an important source of drinking water in Laiwu city. Expanding mining in Panxi coal mine may affect water supply. Through analysis on groundwater recharge, runoff and discharge conditions and hydrogeological boundary, based on the observations of groundwater dynamic data, it is regarded that water source and expanding mining area are in different hydrogeological units and geomorphic units. Expanding mining in Panxi coal mine has little effect to water source.