The probability of detection ( POD) and its influence factors in marine search and rescue were studied. The eduction and application of sweep width and exponential detection function, which were the core influence fac-tors of POD, were mainly discussed. The modification models of sweep width and exponential detection function were put forward, so as to provide theoretical basis for practical marine search and rescue actions with higher accu-racy, promote the development and application of assistant decision system in marine search and rescue of China, finally improve the POD and guard the human life and properties safety at sea.%对海上搜救中发现概率及其影响因素进行了研究。重点探讨了影响发现概率的核心因素扫海宽度和指数探测函数的得出和应用，并提出了扫海宽度的修正模型和指数探测函数的修正模型。以期为实际的海上搜救行动提供更加准确的理论依据，推动我国海上搜救辅助决策系统的开发与应用，最终促进搜寻成功概率的提高，保障海上员生命财产安全。
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