The densities and viscosities of binary mixtures of Choline chloride urea in aqueous media have measured at 298.15, 303.15, 308.15 and 313.15 k temperature. Eutectic mixtures of urea and arrange of quaternary ammonium salts are liquid at ambient temperatures and have interesting solvent properties. The data have been used to calculate the excess volumes deviation in viscosities. The outcome data have been analyzed in terms of molecular interactions existing between the components of the mixtures.