residual levels, distribution, and composition of dichloro-diphenyl-trichloroethane (cultured shellfish along the Fujian coast, China. In addition, we evaluated the risk posed by We collected 20 samples of surface sediment and 46 samples of cultured shellfish from 20 sites in August 2005 and 2006. We measured the residual DDT to 56.6 µg/kg (net weight, mean µg/kg) in the surface sediment. Forty percent of samples’ pollution indexes for the DDTs was between 0.697 and 2.83, which suggested there was a potential ecological risk for DDTs pollution on some extent. µg/kg to 21.7 Maximum Residual Limits published by the European Community, USA, and Japan, and met the sea food safety index set by the Chinese government. Assuming a person ingested a maximum of 50 g/(person·day) cultured shellfish, their intake of DDT would be well below the TDI regulated by WHO and RfD and suggested by US EPA, indicating that the health risk arising from exposure to DDTs is low. were within the middle of the range reported incompared with those reported in water within the Asia-Pacific region. The relative composition of DDT isomers suggested that there has been input into this area in recent years.