This paper is a continuation of the studies on some marine red algae of the Xisha Islands, South China Sea. Some descriptions have been made of ten species. Of these ten，Chondria xishaensis，which belongs to the subgenus Chondria，is a new species to science and six species are new to Chinese waters, namely, Botryocladia pyriformis (Boergesen) Kylin, Coelarthrum coactum Okam. et Segawa, Hypoglossum attenuatum Gardner, Endosiphonia clarigera (Wolny) Falkenherg, Chondria expansa Okam. And C. repens Boergesen. The tetrasporangium of Trematocarpus Pygmaeus Yendo and Botryocladia pyriformis (Boerg.) Kylin are newly described.