The electrochemical kinetic parameters of aluminum, that were used for the anode material of Al-air fuel cell, and related mass transfer properties were investigated. The steady-state polarization experiments with respect to concentration of KOH electrolyte and temperature were performed using aluminum-half cell with rotating disk electrode(RDE). The diffusion of coefficients(~10^-6㎠/s) were determined by the limiting current density data according to the Levich equation. The electrochemical kinetic parameters, exchange current density and transfer coefficient for the anodic reaction of aluminum were estimated.