Abstract: The fluoride is the dominant pollutant of the waste gas in the electrolytic aluminum production. The gas collection efficiency of the electrolytic bath, the air leakage rate and the removal rate of the fluoride of the dust remover greatly impact the discharge amount of the fluoride. It would promote the removal rate of the fluoride by improving the production technology using material balance method to reduce the discharge amount of the fluoride. The method would provide the reference for the purification of the fluoride in the electrolytic aluminum production.