Enthalpies of solution and densities of glycylglycine in aqueous solutions of NaNO3, NaClO4, and Na2SO4 were measured at 298.15 K. Standard transfer enthalpies (Delta H-tr(0)), standard transfer partial molar volume (Delta V-tr(phi)0), and hydration numbers (N-h) have been determined for glycylglycine. All of the Delta H-tr(0) values are negative in the three salt solutions. The relative order of Delta H-tr(0) in the same concentration of 1-1 type salts is NaNO3 > NaClO4. The Delta H-tr(0) in low concentration of Na2SO4 solutions is between the corresponding values in NaNO3 and NaClO4 solutions. With increasing Na2SO4 concentration, the Delta H-tr(0) values exceed that in NaNO3 solutions. The Delta V-tr(phi)0 values are positive and vary in the sequence Na2SO4 > NaNO3 > NaClO4. The results were discussed in terms of various interactions.