The beach soils of intertidal zone and its immediate neighbourhood above negative 5m bathymetric line in Hainan Island have an area about 1.35×10⁵ha, The beach soils are classified into one greatgroup, three subgroups and seven genera. Because the vegetation is poor and mineral nutrients "such as phosphorus and manganese in parent materials resulted from the island is low in the teach land, therefore, the contents of organic matter, nitrogen and phosphorus are low and contents of microelement such as Cu, Zn and Mn are lower than mean levels of soil in China, The salinity of soils varies greatly with ttxture of soils and total salinity of sea water and ranges from 1.2% (sandy tidal flat soil) to 4.1% (muddy tidal flat soil) ,The light and heat resources are comparatively rich and rainfall is relatively abundant with obvious dry season. The surfaces of beaches are considerably flat and stable. It is good for the development of marieulture, solar salts and tourism. But beaches which suit to reclamation by embankment are sparse because soil salinity is too high and land sutface water is not sufficient. It is classified into eight marieulture areas according to the characteristics of beach soils and biological combination. The aolar salts is mainly in the southwestern coast because of strong wind, high salinity of seawater and prevalence of muddy and sandy mnd tidal flat soils. In geenral, the developmental prospect of the area is very promising.