Abstract: The coal-beds are buried deeply in the Cixi 1^# mine;and the mining is mainly menaced by confined water within ordovician limestone.In order to exploit the deep coal resources successfully and ensure sustainable development of mining area,the ordovician limestone water inrush danger is evaluated for 2^# coal seam.On the basis of hydrogeology condition in the east of Fengfeng mining area and Cixi 1^# mine,the mine water filling factor,hydraulic connection between aquifers,effective confining bed thickness of mining fissure zone,floor compressive strength and water-insulating capability are studied,the water inrush danger is evaluated with water bursting coefficient method.The calculations show that the average water bursting coefficient located in the transition zone is 0.056MPa/m in mining under pressure,and it conforms to the conditions of under pressure mining basically.However the coal-beds are buried deeply and regional control level is low,geological and hydro-geological conditions are not clear,supplement exploration must be carried out before mining.