Marine energy is one of the most exciting emerging form of renewable energy. Tidal turbines are used to extract this energy and installed on the seabed at locations with catastrophic loading. This investigation focuses on the numerical simulation of the damage progressive in tidal turbine used for marine energy application under impact loadings. The optimal design and the dynamic behavior of the turbine are studied. Finally, the hydrodynamic and hydrostatic pressures over the loading and the distribution of the stress, the deformation and damaged zone are presented.