ABSTRACT Majiaheba isolated rock mass has distinctive geological background and structure of rock mass, whose potential deformation and stability are important to Xiluodu hydroelectric station. 马家河坝孤立岩体具有独特的地质背景和岩体结构类型,其潜在变形及它的稳定性问题对溪洛渡水电站工程有着重要的意义。