Abstract: Al-Li master alloys were prepared by continuous electrolysis with either LiCl or Li2CO3 as raw material, where the graphite was used as anode and liquid aluminum as cathode in an electrolytic cell with the LiCl-LiF mixture as electrolyte. The technological parameters in electrolysis process were measured by testing device of molten salt electrolysis, including back EMF, current efficiency and alloy concentration, which were all studied in detail. The results showed that the back EMF increases with current density and decreases by 0.8 V if adding 2wt% Li2CO3. Measured by the method of electric potential control, the feeding period is 30~40 min. The current efficiency in electrolysis process for LiCl is higher than that for Li2CO3, and the highest current efficiency can be up to 66.1%. The gross output of 16kg Al-Li alloys in which the average lithium content is 6.73% were thus produced 10 times at 680°C and 300 A by continuous electrolysis for 48 h.