Determination of flood study is of great importance in dam periodical inspection. Based on the statistics of determination factors in the past experience and combined with research results, the determi-nation principles were advanced in the Guide for safety assessment of hydropower dams in operation, for reference.%防洪复核专题确立是大坝安全定检中十分重要的工作，在对以往防洪专题确定因素大量统计分析基础上，在《水电站大坝运行安全评价导则》中提出了防洪专题确定原则，给出背景成果。
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