The formula for calculating the ship impact force under wave action of open sea light wharf is given by considering the elastic deformation of hull and dolphin and the nonlinear behavior of fender. The ship impact force under wave action for flexible dolphin is statistically analyzed by Monte- Carlo method based on the known probability distribution type of random variables in this formula. The probability distribution function and statistical parameters （means coefficient and variation coefficient） under different stiffness ratio of ship impact force are put forward in design reference period. The results show that extreme Type I can be used as probability distribution model of ship impact force under wave action for flexible dolphin in design reference period 50 a. The means coefficient and variation coefficient of ship impact force are 0. 511 and 0. 429, respectively.%考虑船体、靠船墩弹性变形和护舷非线性变形，给出了波浪作用下外海轻型码头结构所遭受船舶撞击力的计算公式．根据公式中各随机变量的概率分布类型，采用Monte-Carlo方法对波浪作用下柔性靠船墩结构所遭受的船舶撞击力进行了统计分析．给出了设计基准期内撞击力的概率分布函数和不同刚度比下撞击力的均值系数和变异系数．结果表明：在设计基准期50a内波浪作用下柔性靠船墩船舶撞击力服从极值I型分布；船舶撞击力的均值系数为0．511，变异系数为0．429．
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