The electrochemical formation of Dy-Fe alloy films was investigated in a molten LiCl-KCl-DYCl3 (0.50 mol%) system at 773 K. The deposition potential of Dy metal was 0.47 V (vs. Li+/Li) at a Mo electrode. Repetition of the potential sweep treatment at a fresh Fe electrode was effective in increasing the rate of formation of Dy-Fe alloys. Using an Fe electrode activated by repetition of the potential sweep treatment, a DyFe2 film was formed by potentiostatic electrolysis at 0.55 V. However, the alloy film was thin and not adhesive. An adhesive DyFe2 film was formed at the activated Fe electrode by potentiostatic anodic electrolysis at 0.55 V after cathodically electrodepositing Dy meal at 0.40 V. By using a similar procedure, Dy6Fe23 was formed at 0.68 V. The equilibrium potential for (2/11)Dy6Fe23+Dy(III)+3e(-)reversible arrow(23/11)DyFe2 was estimated as 0.62 V.