Abstract: With the increasing construction of submarine pipeline projects, the corrosive environment of submarine sediments has attracted more and more attention. The sediments collected in Sanya bay In March 2017, according to the comprehensive analysis of corrosion factors such as type, pH, Eh(Redox potential), organic carbon content, total salt content, Fe³⁺/Fe²⁺, sulfides and sulfate reducing bacteria of the sediments. determined the redox environment of the sediment and evaluated the corrosivity of the sediment. According to the evaluation, the sediments in the seabed of the Sanya bay as a whole show strong oxidizing environment, a weak oxidizing environment locally, and weak corrosion intensity, which is more suitable for the construction of a submarine pipeline project.