Based on the hydrogeology data before and after mining, floor water burst and water inrush and water plugging data of 182306 working face of Wutongzhuang Mine, the reason of the floor water burst was analyzed. The reason was the unknowing hidden water flowing subsided column under coal seam floor and strong runoff zone of Ordovician limestone aquifer. Hydraulic jet technology, multi-branch horizontal well technology was adopted according to large water burst, the water hazard was controlled in 65 d, the mining recovered quickly.