Longyou Grottoes, with the characteristics of the structure of oblique roof plus rock pillar, big excavation, shallow burial and not good surrounding rock, exists the problem of instability. In order to protect it chronically, it is necessary to carry out varied researches, such as the study of the influence on the stability of the underground cavity of horizontal roof by the buried depth. In fact, the buried depth is an important factor that impacts the stability of the horizontal roof underground cavity. The elastic-plastic finite element method is utilized to compare and analyze some factors influenced by the buried depth, such as the displacement and stress field and the damaged area of the surrounding rock. It is concluded in the paper that the buried depth. The result helps to further understand the deformation and failure regularities of some horizontal roof cavities or the left open stope in the horizontal layer, and to assess their stabilities.
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