Abstract: In order to analysis the mechanism of thick coal seam working face water rush in the Ordos Basin in North China,by taking the case of caving coal 4 water bursting in a coal mine in Huating corporation,and research on the height devolepment of water conducted zone with key strata position,this study analysises on form layers of which in this region towards the forming conditions of roof bed separation water,and by the verification of water quality testing,determines the source of working face water bursting and its formation mechanism,guides the direction of comprehensive prevention and control of water.In this study,the analysis of regional roof bed separation water provides an important reference value to the water prevention and control design and its measures developing of thick coal seam mining in Huating mining area even the Ordos Basin.