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In the reliability design of the breakwater armor layer, it is often necessary to calculate its damage accumulated over the life of the breakwater. In this paper, comparison is made between the two methods proposed by Hanzawa et al. in 1996 and Melby and Kobayashi in 1998 to calculate the cumulative damage of the breakwater armor layer. In the case where a severe damage occurs at the beginning of the life of the breakwater, the two methods do not show significant difference, but in general the former predicts a cumulative damage several times larger than the latter.