The geological conditions of Dagangshan Hydropower Station are complex and the earthquake intensity in the dam site area is high, so it is difficult to control the global stability of the dam. Based on the geological conditions and the reinforce-ment measures of foundation, the displacement and stress of the dam are calculated and analyzed by using the three-dimensional nonlinear FEM. Then the global structural stability of the dam is studied by overload method. Comparing with other high arch dam projects in China, the global stability of Dagangshan arch dam is relative higher, and the design measures are feasible.%大岗山水电站坝址区地形地质条件复杂、地震烈度高，整体稳定性控制难度大。基于大岗山拱坝的地质条件及基础加固处理措施，采用三维非线性有限元法，对正常工况下的坝体位移、应力和超载能力进行了计算分析，并使用超载法研究了大坝结构的整体稳定性。研究结果与国内其它高拱坝工程的对比分析表明，大岗山拱坝的整体稳定性较高，设计措施可行。
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