Stainless steel was widely used in industrial production with its excellent oxidation resistance, corrosion resistance and other properties. But in the marine environment, the stainless steel material was affected by the seawater environment easily and the corrosion resistant properties reduced. It was analyzed that the corrosion mechanism of stainless steel in seawater, and the influence factors of influence in seawater corrosion of stainless steel were discussed from the angle of content, salinity, dissolved oxygen and water flow rate, microbial. Finally the research situation of the current stainless steel anti-corrosion technology was discussed.