The method of plane finite element and three-dimensional elastoplastic damage element was adopted to demonstrate the stability analysis of surrounding rock of underground powerhouses in Xiangjiaba hydro-power station in China. The effects of mechanical parameters of the surrounding rock and mechanical model on the plastic region, stress and displacement was discussed. The distribution of displacement, stress and plastic zone of surrounding rock of the cavern is reasonable without anchor support and the surrounding rock is generally stable. But if stress concentration and through plastic region forms locally, the stability will be worsened. When anchor support is adopted, the area of distribution will be reduced and the stability will be improved. The stress of anchor bolt and prestressed cable are both less than their yield stress, thus the surrounding rock is stable and global stability can be guaranteed after anchor support.
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