This report is concerned with the combination method for fatigue damages produced by several wave-induced loads based on correlation coefficient method. Several loads, such as dynamic water pressure, cargo inertia force and hull girder bending, act on ship's hull structural members with different amplitudes and phasees. The correlation coefficient method is proposed as one of methods to combine these extreme loads in the long-term distributons. In this report, authors extend the correlation method to combine not only extrem values but also the whole shape of wave induced long-term distribution. If properties of the most sever short-term wave conditions which dominates the long-term distribution of wave-induced load are almost same condition, long-term distributions can be combined using correlation coefficient. Based on S-N curves σ=CNⁿ, long-term distribution of wave induced stresses by the loads and Miner's rule, fatigue damages in each stress components can be calculated by following equation. {D₁₂} ^-2n= {D₁} ^-2n {D₂} ^-2n+2ρ {D₁} ^-n {D₂} ^-n Where D₁ and D₂ are fatigue damages obtained from each stress components, D₁₂ is combined fatigue damage acting two stress components and ρ is the correlation factor between their stress components.