Shanfu Mine planed to mine No. 15-3 coal seam, with small water resistance layer thickness to underlying Ordovician limestone aquifer, in order to prevent the effect of Ordovician limestone water to safe mining, No. 15-3 coal seam water burst danger was summarized by analyzing mine hydrogeological conditions, calculation of rock mechanical characteristics of water-proof layer, evaluation of water inrush coefficient method, Thickness and mechanical property index of mine waterproof layer could enable to support the water source pressure of limestone water, water bursting coefficient method proved the mining with pressure area as the water burst threaten area, with small odds of water burst, without water burst measures without water conductive structures.