The electrochemical behavior of lithium incorporation into aluminum electrode in LiTFSI/NaTf molten salt electrolyte was studied with electrochemical techniques，including cyclic voltammetry，chronopotentiometry and chronoamperometry.The reduction reaction was found to involve a nucleation process at the aluminum electrode，and only one LiAl alloy phase was reversible.The galvanostatic cycle experiments showed that the coulombic efficiency was very low in the first cycle and decreased with increasing current density，and increased with increasing operating temperature.The results of chronoamperometry indicated that the incorporation of lithium into aluminum for the formation of α-phase Li-Al alloy was limited by its rate of diffusion，with a measured diffusion coefficient of 1.7×10-10 cm2·s-1.