This thesis concerned with the study of solute-solvent interaction of amino acids: [DL-Valine, DL-Isolucine, DL-Methionine, DL-Glutamine, L-Arginine and DL-Histidine] as solutes in water and in hydrochloric acid solution (0.1 mol.L.-1) as solvents. This study covered experimental measurements of partial molal volume from precise density measurements using Anton Paar (DMA 60/602) densimeter, as well as theoretical alculations concerning partial molal volume, and some related parameters, a comparison and discussion was made in the light of these measurements. Measurements of the dynamic viscosities of amino acids solutions have been done over concentration variation from (0.04-0.2 mol.L.-1) for DL-Valine, DL-Methionine and L-Arginine, and from (0.002-0.004 mol.L.-1) for DL-Glutamine and DL-Histidine due to limited solubility for them, and from (0.055-0.27 mol.L.-1) for DL-Isolucine at four temperatures in the range of (293.15-308.15)K. The resulting data have been utilized to veritfy the validity of Jones and Dole equation, and the viscous behaviour of the systems have been interpreted with regard to the contributions of the various viscosity components and the arrangements of solvent molecules. It was found that B-coefficient of amino acids in this study follow the order: Isolucine ? Methionine Valine Arginine Glutamine Histidine This study clarifies that each of B-Coefficient, Partial Molal Volume, Van der Waal's Volume and Effective Flow Volume can be considerd as parameters to account for solute-solvent interaction.