Abstract:hrough analysis on hydrogeological characters and mine water infilling factors of coal mine, it is considered that main water filling sources are sandstone fissure aquifer of roof and floor in No.3 coal stratum and the third section of limestone karst fractured aquifer. By using "big well method", water inflow amounts of coal wells have been estimated, and normal mine inflow is determined as 279m3/h. It will provide believable basis for mine design.