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拱坝本身安全度较高，但必须建立在两岸坝肩基岩稳定的基础上，国外拱坝失事绝大多数由坝肩岩体失稳引起地身破坏。我国对此已开始重视，把拱座稳定分析列入了拱坝规范。拱坝坝肩稳定问题已成为决定拱坝方案、设计和施工成败的关键。西水峪水库拱坝，是一座中型拱坝。根据西水峪地质情况，从拱坝坝肩稳定计算出发，对如何合理选择可能滑动面和滑动岩体，作出了结合实际情况的计算项目，采用按单位高度拱圈和分层累计两种计算方法，列出了稳定安全系数计算结果，提出了对西水峪拱坝坝肩稳定的看法和尚需进一步做的工作。
Arch dam itself is safe, but must be based on the stability of the abutment bedrock of the two sides of the Strait. Most of the foreign arch dam failure caused by the failure of the abutment rock mass caused by body damage. My country has begun to attach importance to this, the arch stability analysis included in the arch dam specifications. Arch dam abutment stability issue has become the key to determine the arch dam program, design and construction success or failure. Xishuiyu reservoir arch dam, is a medium-sized arch dam. According to the geological conditions of Xishui valley, starting from the stability calculation of arch dam abutment, this paper makes a calculation project about how to choose the possible sliding surface and sliding rock mass rationally according to the actual conditions. Method, the results of the calculation of the stability safety factor are listed, and the opinions on the stability of the abutment of Xishuiyu arch dam are put forward and further work needs to be done.