Abstract: The variation feature and biological concentration factors of heavy metal element in commercial marine organisms from Daya Bay were discussed in this paper. It showed that the heavy metal contents in crustacean samples were the highest and the heavy metal contents in fish samples were the lowest among the three kinds of organisms. The order of heavy metal contents in the organisms was zinc(Zn) >copper(Cu) >lead(Pb) ≈arsenic(As) >cadmium(Cd) >mercury(Hg). The biological concentration factors of Cu and Zn were higher than the other elements, while the factors of As was the lowest among the elements. The marine organism heavy metal contents were lower than the threshold values of " non-environmental pollution food, the limit for the deleterious matters in the aquatic product".According to the result of potential risk factors, there were some potential risk of Cd, Pb and Hg, while the potential risk of Cu was low.