Based on the comprehensive analysis of the tenth Coal mining area in Cancun coal mine，the K₈ sandstone and the pore-fissure aquifer of Quaternary are the rminly water filled aquifers for 2^＃ coal. The lower seams of the tenth mining district aremainly affected by the K₂ sandstone from apicalplate and the Ordovician limestone water-bursting from soleplate.Through the quantitative calculation of the Ordovician limestone water-inrush and the analysis of the risk of water-bursting, it shows that the risk of water- bursting in the I area is small.And it should focus on a lower risk of Ⅱ，Ⅲ area for detecting and moni- toning. The partly slip-casting in the water - rich area could increase the grouting reinforcement of water bottom thickness and strength for the purpose of controlling the water.