A new electrochemical process for the surface nitriding of titanium has been developed. A LiCl-KCl eutectic melt is used at 450-degrees-C as a model solvent. When KNO3 or KNO2 is dissolved in the solvent and the titanium electrode is cathodically polarized in the melt, surface nitriding of titanium can be achieved. On the other hand, when Li3N is dissolved in the solvent and the titanium electrode is anodically polarized in the melt, it can also be achieved. In both cases, adsorbed nitrogen atoms react with the outer most surface and diffuse into the bulk of titanium electrode to form a nitride layer. This principle has been successfully confirmed by the experiments.