Duplex stainless steels (DSS) are the good materials for marine application because of their well resistance to pitting corrosion, intergranular corrosion and chloride stress corrosion. But the welded joint is usually the weakest zone of DSS which often causes various corrosion problems. The research progress of DSS corrosion has been reviewed from the perspective of material factors. Firstly, the effects of alloy element and heat treatment on the resistance of DSS corrosion were summarized. The corrosion resistance is determined by the distribution of alloy elements, the precipitation of secondary phase and the ratio of ferrite to austenite. The solution treatment can eliminate the secondary phases and the Cr-depleted zones adjacent to the secondary phases, mend the ratio of ferrite to austenite, and improve the corrosion resistance of DSS. Secondly, the corrosion characteristics of DSS welded joints were analyzed, and the effects of welding method, heat input, shielding gas and post-weld heat treatment on the corrosion resistance of welded joints were summarized. The resistance to localized corrosion of tungsten inert gas welding (TIG) joint is well. The corrosion resistance of welded joint can be improved by adopting multi pass welding with suitable heat input and controlling over interlayer temperature. Although the solution treatment can improve the corrosion resistance of the joint, it is difficult to be applied to the welded joint of pipeline and other engineering components. Finally, the current problems of DSS corrosion research are discussed, and the future research trends are pointed out.