The present study was based on the collection from the Xisha Islands by the Institute of Oceanology, Academia Sinica in May, 1975, and by the South China Sea Institute of Oceanology,Academia Sinica in May, 1974, and April, 1975. Ninety five species of spumellarian radiolaria belonging to 10 families and 32 genera, were identified, of which, 45 species are first recorded from the Chinese waters (including 7 new, 2 cf. and 6 indet. ) Type specimens are deposited in the Institute of Oceanology, Academia Sinica. Descriptions of new specis are given below: