Abstract: Seasonal investigations were carried out for 3 cultured areas ( of algae, oyster and fish ) and noncultured area in Xiangshan Bay. 71 species from study areas were identif ied. 45 species of them were collected in cultured areas, 61 species in non-cultured area, 35 species from both cultured and non-cultured areas. The biomass and density in oyster and f ish cultured areas were 433. 53g ..m- 2 and 155ind..m- 2, 91. 92g..m- 2 and 115ind..m- 2 respect ively. It was higher than that in algae cultured area and non-cultured areas. The biomass and density in algae cultured area were 1. 55g..m- 2 and 27. 5ind..m- 2, which was lower than that in non-cultured area ( 5. 24g..m- 2 and 53. 04 ind..m- 2) . No macro-benthic species was found in the center of f ish cultured area. The relativity of the benthos with sediment, reared biology and hydrographic factors is discussed.