Based on the experience of periodical inspections for hydropower dams, the paper analyses the main influence of slope failure on safe operation of the dams. Moreover, the main contents and principles in slope stability assessment are summarized. As well, the principles in safety rating of slope are ad-vanced, for reference.%基于我国水电站大坝安全定期检查的长期实践经验，分析了运行水电站边坡失稳对大坝运行安全的主要影响后果，归纳了边坡稳定状况评价的主要工作和原则，提出了边坡安全级别确定的原则。
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