The research bases on the three major sides : stochastic mechanics of engineering, reliability analysis and the design method of reliability . the paper establishes the stochastic element method and the reliability optimal model . the reliability of platform, based on the stochastic element, was calculated 本文圍繞目前海洋工程中不確定問(wèn)題的概率分析中包括的三大方面:工程隨機(jī)力學(xué)、工程的風(fēng)險(xiǎn)評(píng)估和可靠度分析、基于可靠度理論的設(shè)計(jì)方法,進(jìn)行了研究,建立了海洋平臺(tái)隨機(jī)有限元可靠性模糊優(yōu)化模型。