Abstract: Some coral sand islands have experienced gravel loss in recent years due to natural and human factors.A coral sand island in Xisha was studied as an example.Features of the marine environment including tideway,tide and wave,were analyzed utilizing the dynamic environment data of the South China Sea.With field testing analysis,remote sensing and other methods,the evolution process such as development and formation of the island were revealed.This paper also proposes management of the loss of coral sand, and provides a reference to the key technologies and approaches for exploitation and protection of the coral sand island.

Key words: Coral Island, Dynamic Environment, Silt, Evolution