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Mg-Hg-Ga alloys were prepared in this study.The relationship between compositions and phase constituents of the casting alloys were investigated by X-ray Diffraction.The galvanostatic curves of the alloys in 3.5wt% NaCl solution were obtained.When the Ga/Hg ratio is more than 0.97, the second phase changes from Mg3Hg to Mg5Ga2.With the Ga/Hg ratio increase, corrosion inhibited and passivation appeared.When the Ga/Hg ratio is less than 0.68, with the Ga/Hg ratio increase, discharge process becomes steadier and discharge time becomes longer.Corrosion occurs mainly around the second phase Mg3Hg.