Abstract:Based on the data collected by shrimp beam trawlers survey in the East China Sea(26°00′-33°00′N; 120°00′-127°00′E)in may, 1998, the spatial variation of shrimp species composition, Index of relative importance (IRI), abundance, biomass and the community structure‘s diversity and similar characteristics were analyzed. 52 species of shrimp were found in this research, and 43 species were identified, which belonged to 27 family under13 genera. Index of relative importance (IRI) was used in this paper to determine the importance of species, 14 dominant species are listed: Metapenaepsis dalei, Parapenaeus fissuroides, Metapenaepsis barbata, Palaemon gravieri, Solenocera crassicornis, Plesionika izumiae, Trachypenaeus curvirostris, Metapenaepsis tenella, Metapenaepsis longirostris, Solenocera alticarinata, Parapenaeopsis tenella, Metapenaeus joyneri, Crangon affinis, Solenocera koellbeli.. The shrimp in the East China Sea in spring were divided into 3 ecological types: a eurythermal and hyposaline community, a eurythermal and eurysaline community and a hyperthermal and hysaline community.The abundance and biomass of the station in the north of 30°00′ were lower than in south. The diversity of shrimp community in the East China Sea was indicated by 3 factors: Margalef index (D), Shannon-Wienner index (H′) and Pielou’s evenness index (J′). The stations with high Margalef index (D) and Shannon-Wienner index (H′) were mainly located in the north of the Zhou Shan fishing ground, whereas the Pielou’s evenness index (J′) was stable all through the East China Sea. By hierarchical cluster analysis and non-metric multidimensional scaling (NMDS) assisted analyzing, the types of shrimp assemblage determined by influential factor such as aquatic system, water mass and salinity etc. in the East China Sea in spring were also discussed in this paper.