Based on the bottom trawl surveys in four seasons from 2006 to 2007 inside bottomtrawl fishing forbidden zone line of Jiangsu sea area and the near zone,we explored the temporal and spatial distributions of Larimichthys polyactis Bleeker resources in this target area,as well as their mechanism.The results showed that:(1) spawning and feeding groups in offshore areas of Jiangsu Province were composed of South Yellow Sea population mainly,with East China Sea population and smaller YellowBohai Sea population;(2) the biomass of Larimichthys polyactis Bleeker was higher in spring and summer,with the highest in summer,and decreased following the order of spring,autumn and winter;(3) the distribution areas extended to north gradually with seasons,and the move tendency was obvious from autumn to winter;(4) in the radiating sand ridge and the surrounding regions,total average biomass of Larimichthys polyactis Bleeker in a year was much higher than that in the north-central area of the offshore areas of Jiangsu Province,while an opposite tendency was found in winter;(5) there was a stable group composed of South Yellow Sea population and East China Sea population in some areas near the south of Yangtze River estuary all through the four seasons;(6) the groups reaching the stage of sexual maturation migrated to the target area,spawning and hatching in spring,and there was a high group density of juveniles in summer,nevertheless,there was a dispersing tendency of juvenile groups gradually as the target area was not a stable feeding ground.