Abstract: Interfacial fluctuation between electrolyte and aluminum plays an important role in stability and current efficiency of electrolytic aluminum process. A mathematical model of electrolyte/aluminum/gas multiphase flow in aluminum cells based on a computational fluid dynamics (CFD) method was built to study the interfacial fluctuation between electrolyte and aluminum caused by gas exudation. Furthermore, the effects of three different aluminum electrolysis cells were analyzed, including traditional, cuboid cathode and small cube cathode cell. The results showed that it takes 45 s for the fluctuation to reach a steady situation. After that, the changing of amplitude is very small. The interfacial fluctuations in three different aluminum electrolysis cells have same trend, and the wave amplitude in cuboid cathode aluminum cell is smaller than that in the others.