The mechanical specimens of composites with unidirectional fibre were subjected to seawater immersion tests,then the tensile and flexural properties of the composite with different test time lengths were tested,and statistical an-alyses were performed on the test data of mechanical properties.The results showed that seawater did not give too much in-fluence on the mechanical properties of the composites in 2160hs.the degree of dispersion in the numerical values of the composites mechanical properties did not increase when test time increased.Due to the relatively large absolute value of the mechanical property,the numerical perturbation has less effect on the coefficient of variation,and the confidence level of the coefficient of variation is high,which makes the structural design based on the regularised values more reliable compared to the maximum fugitive residuals.
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