The effect of temperature on density, viscosity, and surface tension of 1-butyl-3-methylimidazolium methylsulfate [bmim][MeSO4] and I-ethyl-3-methylimidazolium ethylsulfate [emim][EtSO4] ionic liquids (ILs) has been determined. Viscosity values of both ILs above-mentioned have been modeled by the Arrhenius equation and the Vogel -Fulcher-Tammann expression. Density, viscosity, surface tension, and surface excess energy of [bmim][MeSO4] and [emim][ESO4] decreases as the temperature increases.