Abstract: In order to study the characteristics and related factors of bed separation water inrush hazard, this paper counts and analyzes the spatial and temporal distribution, regional distribution, time distribution and rank distribution of water damage accident of bed separation water inrush hazard in detail. It summarizes occurrence conditions, the water filling source, water diversion channel, water inrush form and mining conditions. The result shows that the bed separation hazard inrush of the excavation of near horizontal thick coal seam under cretaceous sandstone aquifer is the widest distribution range, the most water inrush times, and the most accident grades and deaths. The period of resumption of production after the festival and climate change is the high incidence period of bed separation water inrush hazards caused by human factors. The large thick-hard rock aquifer and the combination strata of water-bearing and water-resisting layer both are occurrence forms of bed separation water filling. The main excavation condition of bed separation water inrush hazard is the thick coal seam excavation or the gently inclined coal seam excavation.