Goaf lag bottom water burst happened in 15423N working face of Jiulong Mine, based on hydrology geology work before mining and the characteristics of the working face after water burst, the water control and prevention scheme were settled, through the verification of drilling material, micro concealed water collapse column developed under the coal seam bottom, which was the main reason to cause the water burst, the feature of large bury depth, large flow and high pressure of the collapse column were analyzed, the quaternity of aggregate infusion, aggregate cementation, channel closure, water reinforcement comprehensive collapse column control were studied, which solved the water disaster of the collapse column and eliminated the water disaster.