The present study is based on the collections of seaweeds in the years of 1957,1958,1975,and 1976 from the Xisha Islands. There are eleven genera in Ceramiaceae. This paper reports eight species which belong to four genera: Anotrichium, Spermothamnion,Griffithsia and Centroceras. Three species are recorded here for the first time from the Xisha Islands,namely, Anotrichium tenue (C.Ag.) Naegeli, Griffithsia metcalfii Tseng, and Centroceras clavulatum Montagne. The three other species are reported for the first time from China, namely, Griffithsia coacta Okam. Spermothamnion yonakuniensis Yamada et Tanaka, and Centroceras japonicum Itono.