Abstract: The Zhongguan iron ore is an Ordovician limestone karst mine which was eroded by water.And it has been threatened by serious flood during mine construction period.On the basis of detailed analysis of the character of the aquifer of the mining area，the law of water content change and the characteristics of groundwater movement，this study has analyzed the Zhongguan iron ore′s law of water level variation around the water blocking curtain and control strategy of water bursting in mine.It turns out that：the dynamic changes of groundwater around the curtain are not only affected by regional groundwater flow conditions and season alternating，but also by the curtain itself and mine tunnel construction inside the curtain region and sewer drainage.According to the macro understanding of mine hydrogeological conditions and law of water level variation around the water inrush，detecting water by pilot hole，construction of water storage sump，super stages drainage in mine and of groundwater level and continuous observation of mine water inflow of outburst mine and other control strategies of water bursting in mine during mine construction period have been put forward in this paper.

Key words: Zhongguan Iron Mine, Grouting curtain, Law of water level variation, Water inrush, Countermeasure