Abstract: The hydro-geological conditions in Daye Dahongshan copper mine is complicated.The implementation and the desired effect of the curtain grouting and exclusion of water project is the premise to realize the mining safety.Both of the first step that chamber mining is constantly developing and consummating and the second step that the sublevel open mining with filling subsequence from the top column to the end is successfully researched and promoted are of significance to realize the safe，efficient，low-cost，low-loss depleted，high recovery rate and stable production.Three-dimensional numerical simulation commends to adopt the top-to-bottom，central-to-end mining sequence to control the underground  pressure，and provide guidance to the prevention and treatment of mine water hazard and the safety; The investigation and analysis of the characteristics of underground pressure activities and the adoption of a series of pressure-controlling measures，especially the establishment of long-range automatic pressure monitoring system and its long-term stable operation guarantee the safe production in mining areas.

Key words: Curtain, Mining method, Stopping sequence, Geostatic control