Abstract: Heavy metals (Zn, Cu, Pb and Cd) were analyzed in surface seawater and sediments collected from Bachimen sea area of Dongshan Bay in October 2013, and then potential pollution risks were assessed. Our results indicated that heavy metals in seawater was qualified as GradeⅠof national Sea Water Quality Standard, and that the pollution level was relatively low based on the heavy metal pollution index method. Additionally, the contents of Pb, Cd and Zn were relatively low assessed as GradeⅠof national standard Marine Sediment Quality. The potential ecological risk index was higher in sequence of Cd, Cu, Pb and Zn. Heavy metal pollution in sediments was limited in general, but the potential ecological risk index of Cd in some stations exceeded 40, to which the attention should be paid. Heavy metal pollutions were at the low level in general based on the geo-accumulation index which arranged in order of Zn, Cu, Pb and Cd. It was found that the contents of heavy metals in seawater in Dongshan Bay increased firstly and then decreased from 1990 to 2013 according to literature data. In the same period, the contents of heavy metals in the seawater were similar compared with other sea areas of Fujian Province, but the contents of heavy metals in the sediments were higher in general.