The use of the zinc anodes having superior character is the simplest and most effective method for the corrosion protection of ship hulls. In order to find the anodes, we carried out some experiments with various zinc anodes containing different kinds of elements. From the experiments, it is found that the performances of zinc alloy anodes which contain Hg, Cd, or Al exceed far that of other zinc anodes containing Mg, Mn, Te, Ge, or K etc.