In the field of engineering geology and rock mechanics, the instability problem of bedding slope is one of the key problems that need solutions. Based on the geological background of bedding slope and mechanical mechanism, abstract out the damage mechanics model of bedding slope collapse. Using plate column and plastic pressure lever stability theory, combined with the material mechanics knowledge, we deduced the corresponding calculation formula. Utilizing the theory method and the established displacement criterion, and combined with engineering field effective measuring method, can be convenient and effective to decide rock bedding slope stability.%顺层边坡的失稳问题一直是工程地质学和岩石力学领域内极为瞩目和急待解决的问题之一。本文根据顺层边坡的地质背景及力学作用机制，抽象出了顺层边坡溃屈破坏的力学模型。利用板柱塑性压杆稳定性理论，结合材料力学的知识，推导出了相应的计算公式。利用文中理论方法及所建立的位移判据，并结合工程现场有效的量测手段，可方便、有效的判定岩质顺层边坡的稳定性。
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