Abstract: Based on the laminate equivalent stiffness model,the laminates of composite ship hull were simplified as orthotropic lamina,and using degenerated 3D single lamina a whole ship finite element（FE） model was established.With this model,stiffness of equivalent lamina and grid refinement was adjusted to precisely reflect mechanical properties of laps with local reinforcement.The results from the FE calculations on the modals,stiffness and local stress of whole ship under different load conditions were compared with the experimental results.It shows that using this method not only consume less working load but also can meet the requirement of engineering application.