Three newly recorded species of aquatic angiosperms were reported from Hainan.They were Nechamandra alternifolia(Roxburgh ex R.Wight) Thwaites (Hydrocharitaceae),Limnophila heterophylla (Roxburgh) Bentham (Scrophulariaceae) and Acorus calamus Linnaeus (Araceae).They grew in the Yangshan wetland with unpolluted water of Haikou.Specifically,Nechamandra alternifolia and Limnophila heterophylla were rare.So they were as further evidence information to support the claim that Yangshan wetland was an important area of species distribution.