Based on sediment monitoring results of the sea area around Lvhua relieving platform in spring, summer, autumn of 2012, this paper educes the following conclusion :(1)In this area, the content of mercury(Hg),arsenic(As),copper(Cu),lead(Pb),cadmium(Cd) and chromium(Cr) accorded with the first class evaluation criterion in the marine sediment quality; Compared with 2006,the content of iron(Fe) increased significantly.(2)Both evaluation results of the geoaccumulation index and the potential ecological risk index led to the same conclusion that Hg, As, Pb and Cr were not contaminated, while Cu was slightly polluted and the situation of Cd was even worse.(3)According to the potential ecological risk index evaluation,for potential ecological hazards, Hg, As, Cu, Pb and Cr were of low levels while Cd was of higher degree.The comprehensive potential hazards of the above 6 kinds of heavy metal were of moderate levels in this area.(4) The discussion of different effects with various background parameters indicated that an appropriate choice of parameters was of great meaning in heavy metal pollution assessment.