To understand the seasonal variation in the shrimp communities, temporal changes in species composition and community structure of the shrimp community in the Lvsi fishing ground were examined based on data from bottom trawl surveys during spring and summer of 2010.The result indicated that a total of 18 shrimp species were identified, among which 11 were identified in spring and 15 were identified in summer.In spring, it was mainly composed of warm temperate species.Palaemon gravieri was the dominant species in spring, accounting for 52.76% and 64.03% in the individual density and weight density, respectively, while Alpheus juponicus and Alpheus distinguendus were common species.Most of them were warm temperature adapted.In summer, the sea water temperature began to increase, in the meantime, a large quantity of freshwater was found in the area, as a result of the influence of the rainy season and the Yangtse River diluted water.Consequently, shrimp communities showed an obvious succession(R=56%), and warm water species became numerically dominant, for example, Parapenaeopsis hardwickii and Solenocera crassicornis were predominant species in summer, and most of the species belonged to the Indo-West-Pacific warm water region.The warm-temperate species, however, were distinctively decreased during summer.In short, shrimp ecological groups' change in the Lvsi fishing ground during the spring and summer is related with seasonal and hydrological changes.