The densities and refractive indices of ternary system of bis(2-hydroxyethyl)ammonium acetate (bheaa) + monoethanolamine + water have been measured at T = (303.15 to 353.15) K. The measured density and refractive index data were correlated as a function of concentration and temperature. Excess molar volumes and refractive index deviations were calculated from the measured densities and refractive indices at each temperature. The excess molar volumes are negative and the refractive index deviations are positive at all conditions. © 2013 Elsevier B.V. All rights reserved.