本文明确提出了海浪能量外观分布的概念,并将其简称为“外频谱”以便区别于通常的海浪频谱。文中依据作者先前提出的海浪波高与周期的联合分布,从理论上首次导出了外频谱的一种三参量Cauchy型解析分布形式,并简要讨论了外频谱与通常海浪频谱之间存在某种相似性的力学根据。鉴于Bretschneider谱一直被视为通常的海浪频谱而在工程中广泛应用,文中还考虑了将Cauchy型外频谱作为通常海浪频谱使用的可能性与优越性 This paper clearly put forward the concept of ocean wave energy appearance distribution, and referred to as “outer frequency spectrum” to distinguish it from the usual wave spectrum. According to the joint distribution of wave height and period previously proposed by the author, a three-parameter Cauchy-type analytical distribution of extra-frequency spectrum is derived for the first time in theory, and a brief discussion is made on the similarity between the extra-frequency spectrum and the normal wave spectrum Based on mechanics. Since the Bretschneider spectrum has been widely used in engineering as the usual ocean wave spectrum, the possibility and advantage of using the Cauchy extra-frequency spectrum as the usual wave spectrum are also considered