Nafion/polypyrrole and Nafion/Dimethysulfoxid (DMSO) organic coatings were prepared on the surface of pure magnesium by simple immersion and heat treatment. The morphologies and corrosion resistance of the organic coatings were investigated by using optical microscopy and electrochemical corrosion testing, respectively. It is shown that Nafion/polypyrrole organic coatings resulted in the corrosion resistance of magnesium decreasing;while Nafion/DMSO organic coatings can effectively improve the corrosion resistance of magnesium. Also,the corrosion resistance increased with the thickness of the Nafion/DMSO organic coating increased.