The present paper is a preliminary study of the Subfamily Gastrosaccinae (Crustacea, Mysidacea) collected mainly from the continental shelf of the South China Sea by the Institute of Oceanology, Academia Sinica. The samples were taken with a benthic sledge net during 1958- 60 from the shelf of northern South China Sea. Materials from Xisha and Zhongsha Islands collected with plankton net during 1974-81 by the South China Sea Institute of Oceanology, Academia Sinica, are also included. A total of 12 species belonging to 4 genera are identified and reported, of which 6 are recorded for the first time from Chinese waters.