Abstract: The groundwater overexploitation is serious in North China Plain, and about 2/3 of them have the problem of deep confined water overexploitation.Dredging and drainage mining in the groundwater overexploitation area will aggravate the expansion of groundwater falling funnel and seriously damage the regional groundwater ecological environment.For the contradiction of the high quality mineral resources exploitation, regional groundwater resources protection and the protection of groundwater environmental, the curtain grouting is proposed to cut off 70%-80% of the hydraulic connection between the deposit and the regional underground aquifer.The curtain grouting, using surface pre-grouting to effectively protect the curtain groundwater static reserves,and later recharging the remaining 20%-30% dynamic groundwater recharge inside the grouting curtain, finally realizes the method system of zero groundwater discharge in large water mine.In this paper, the requirements of curtain grouting scale division, construction procedure and determination of technical parameters are clarified, and the number of pre-grouting boreholes, grouting pressure and determination of groundwater recharge wells are improved.The above method system has been practiced in Zhongguan Iron Mine, a typical water-heavy mine located in Baiquan, and the ideal effect of zero discharge of mine water has been achieved.Such technical system, principle and methods can be used for reference to solve the urgent problem of groundwater protection faced by domestic and foreign high-water mines.