Densities and sound velocity have been measured over the whole composition range for the binary liquid mixtures of methyl tert-butyl ether with propylamine and dipropylamine Using in Anton Paar DSA 5000 density and sound analyzer at temperatures of (288.15, 293.15, 298.15, 303.15, and 308.15) K and atmospheric pressure. From these densities and speeds Of sound, excess molar volumes and excess isentropic compressibility were calculated. All of the properties were fitted to Redlich-Kister equation. The variation of these properties with composition and temperature of the mixture is discussed in terms of molecular interactions.