The polychaete fauna was studied at 10 stations in Jiaozhou Bay,with seasonally sampling in 1991～1995.The biomass,density and diversity were calculated.The polychaete fauna was divided into four groups:1 Eurythermiceurytopic species,2 Eurythermicwarm temeprature species,3 Eurythermictropical and subtropical species,4 Cold water species in north of China.The dominant species were eurythermiceurytopic species and eurythermicwarm temperature species.The average biomass and density were 5.14g.m-2 and 82...