Subfamily Mysinae is one of the most important groups of planktonic Crustacea in the shallow coastal waters of the continental shelf in the China seas and is rich in species and abundance. They are fished by local fishermen with fixied net in eertain coastal areas with strong tidal flow (current) and are distinguished by their flavour. Produced by fermentation; they are also used freshly for food. In recent years they have also been utilized as feeds for fish and sea horse (Hippocampus) aquaculture. Consequently, ecological and biological studies of this group of Crustacea inereased fastly in recent years. The present paper is a systematic study of the subfamily Mysinae collected from the northern part of the South China Sea. A total of 32 species belonging to 3 tribes and 17 genera are identified and described. Of these one is new to science and 10 are recorded for the first time from Ghinese coast of the South China Sea. The type materials of the new species are deposited in the Institute of Oceanology, Academia Sinica at Qingdao. Species in the Tribe Mysini inhabited mostly the bottom layer of coastal waters, some of them are cultivated in ponds in very high density.