In　recent　years,　the　rapid　industrialization　and　urbanization　of　coastal　areas　have　caused　serious　environmental　pressure　on　the　Bohai　Sea.　The　investigator　collected　the　concentration　of　7　heavy　metals　(As,　Cu,　Cd,　Cr,　Hg,　Pb,　Zn)　in　the　Bohai　Sea　from　2013　to　2017.The　results　showed　that:　The　main　pollution　factor　of　heavy　metals　in　the　sea　water　quality　of　the　study　area　was　Pb.　The　concentration　of　Hg　increased　significantly　with　the　increase　of　depth.　Hg　and　Cd,　due　to　their　high　toxicity　factors,　are　the　main　potential　ecological　risk　factors　of　surface　sediments　in　the　study　area.　The　main　heavy　metal　pollution　factor　in　living　creatures　is　Pb.　River　discharge,　oil　exploitation,　port　area　activities　and　atmospheric　subsidence　are　the　main　sources　of　Marine　environmental　pollution.　This　study　provides　ideas　for　predicting　the　content　of　another　medium　heavy　metal　in　the　environment　based　on　one　medium.