In this report on the marine red algae in the Xisha Islands, Guangdong Province,China, nine species have been deseribed, Cryptonemia parva is considered to be new species, and three species, one sporophyte generation, namely, Gelidiopsis intricate (Ag )Vickers, Cryptarachne okamurai (Yamada et Segawa)Zhang et Xia, comb.nov, Dasya mollis Harv, and “Falkenbergia hillebrandii”(tetrasporophyte stage of Asparagopsis taxiformis (Del.)Trev.) are new to Chinese waters. The spermatangial stand of Dasya mollis Harv. is newly described. The specimens studied including the type specimens are all deposited in the Herbarium of the Institute of Oceanology, Academia Sinica at Qingda.