Abstract: Analysis on the hydrogeological conditions of Tertiary conglomerate in Huafeng Coal Mine,author suggests that the traditional ideas are lopsided.The water inrush from conglomerate in the coal mine relatives to the water rich property of conglomerate and the pressure bump.The strength of red beds in the floor of Tertiary is too low to have water resisting property,which is one of causes of the water inrush from conglomerate.