Based on the analysis of the water sample and integration of karst groundwater data,this paper analyzes the hydrogeochemical and geothermal characteristics of the hot karst water and its genesis in the western Cizhou coalfield.The results show that the deep karst warm-hot water in Ordovician under the coalbearing strata is SO₄Cl-CaNa type water with high TDS and high hardness,and its formation is derived from the deep seepage of groundwater along faults and long time evolution;the geothermal abnormity is water-heated geothermy with more than 60°C temperature of heat storage and 1500m depth of circulation,and the heat source is from the thermal addition of igneous rock mass intruding in Yanshanian over the regional normal geothermy.The research provides some reference in geothermal research,coal exploitation,prevention of thermal damage and mine water damage.