The refinement of AlCl₃-EMIC ionic liquid with Al wires is important for the Al-deposition. The refinement of acidic AlCl₃-EMIC (2 : 1 ) was studied. The effect of refinement on the viscosity, electronic conductivity and cyclic voltammograms of the ionic liquid analyzed. The galvanostatic electrodeposition of Al on Cu was carried out using a two-electrode system. The effects of refining Al wire on surface morphologies and components of Al wires and electrodeposited Al coatings were examined. The results show that the viscosity and electronic conductivity vary little after the refinement, however, the current efficiency and Al-coating quality increased. After a 168 h-refinement, a dense and adhesive aluminum coating can be electrodeposited. The mechanism of the refinement was also discussed.