Densities and surface tensions for binary systems of ( 1,2,4-trimethylbenzene or 1,3,5-trimethylbenzene + dimethyl carbonate or diethyl carbonate) have been measured under normal atmospheric pressure over the entire mole fraction range at 298.15 K and 313.15 K. The excess molar volumes and the surface tension deviation have been calculated. The excess molar volumes and the values of the surface tension deviation are fitted to the Redlich-Kister polynomial equation. The excess molar volumes for all the binary systems are positive over the whole composition range, and the surface tension deviations are negative.