For protecting the native plants in the roots of Luocheng shoal submerged dike and LL3～LL5 spur dikes,a new special-shaped gabion structure which is based on the standard gabion was created to replace the riprap dike.The special-shaped gabion structure can both satisfy the functional requirements of the project and the ecological-protection of the Luoceng shoal.And this research will provide a reference to the ecological structure design in regulation works for the navigation channel.