Abstract: Taiyuan limestone aquifer is the aquifer directly filled with water in the lower coal mining group of the North China type coalfield.When the lower group coal seam is mined, large disastrous water inrush accidents often occur at the position with strong water supply or close to the water diversion channel. Based on the statistical analysis of water inrush accidents in Taiyuan limestone aquifer in recent years from the aspects of mine hydrogeological conditions, water inrush accident process, causes and characteristics, etc., to determine the water inrush coefficient, aquifer water richness, replenishment conditions, whether the fault structure leads to the coal seam and the stratum relationship is the main variable for the classification and discrimination of water inrush risk in the Taiyuan limestone aquifer. According to the determined water inrush risk classification and discriminant variables, the water inrush risk of Taiyuan limestone(Taihui) aquifer is divided into safety type (roof or floor type), roof water inrush hazard type (with or without replenishment), floor Taihui with single water inrush dangerous type (with or without replenishment), water inrush hazard type associated with Taihui floor and Ordovician limestone aquifer, water inrush hazard type through collapse column or fault, etc., and prevention methods have been formulated respectively, the prevention and control methods are formulated separately. This study can provide a reference for water prevention and control work of coal seam mining in the lower group of North China coal field threatened by the Taiyuan limestone aquifer.