Abstract: Ningtiaota Coal Mine locates at the edge of Maowusu desert Jurassic coalfield which is climate aridity, when the S1210 working face advance 61 m, large roof water inrush disaster occurred which lasted two months, the initial inrush strength was 1 200 m³/h later reduced to 1 000 m³/h and stabled. It breaks the traditional cognition that hydrogeological condition is simple and overlying Jurassic sandstone is weak water yield property and poor permeability of 2^-2 coal. Based on the reanalysis and understanding of hydrogeological conditions, the article presented and implemented an three-dimensional detection technology which unified the geological survey, exploration drilling, geophysical exploration, chemical exploration and hydrogeological real time monitor, etc. It detected and analyzed the source water of water inrush, used the isotope detection technology to analyze hydrological cycle route, and analyzed the whole hydrogeological conditions of working face, which provided technical analysis basis for water disaster control scheme of this working face.