Abstract
With the application of extreme value theory and DNV (note 30.4) method, it (the paper)forecasts the boat amidships vertical bending moments of six bulk carriers and ten oil tankers in different loading conditions, different time periods. After comparing vertical wave bending moment value of extreme value theory with vertical wave bending moment value of DNV method of six bulk carriers and ten oil tankers under all significant wave heights, it's found that DNV approach is 10% to 15% larger than the extreme value. In addition, we also got some meaningful conclusions of two types of ship in different loading conditions.