48 species of Mysidacean Crustacea have been found in the western part of the East China Sea and are reported here. Among them 7, species, viz. Paralophogaster glaber Hansen,Lophogaster pacificus Fage, Gnathophausia ingens (Dohrn), G. zoea Willemoes-suham, Eucopia australis Dana, Boreomysis rostrata Illig. Lophogaster sp, are deep water species with wide distribution range. Their zoogeographical charactersitics are different. Paralohogaster glaber Hansen has also been found in the Atlantic besides the Pacific and Indian waters. Zoogeographical analysis are made here with the 41 shelf species. The following 17 species are widely distributed throughout the tropical Indo-west Pacific or the West Pacific Warmwater Region: