Abstract:In this paper, hydrogeological characteristics and water filling factors of Jinyang coal mine have been analyzed. It is thought that direct water filling source of No.2 and No.3 coal layers are sandstone pore fissure aquifer in the roof of No.3 coal layer in Shanxi group. Through analysis and research on hydrological observation data and hydrological geology drilling hierarchical datas in many years, by using the "analogy method", water inflow amount has been predicated, normal water inflow amount and the maxmium water inflow amount have been determined. It will provide scientific basis and examples for similar research in mines.