Pressure (0. 1-400 MPa), temperature (283. 2-323. 2 K), and concentration (0-3 mol kg-1) dependences of the viscosity of aqueous NaCl, R4NBr, NH4Br, and CsCl solutions are surveyed. The pressure dependences of the activation energies, Ev, for the viscous flow and the Jones-Dole's B coefficients are shown graphically for several aqueous electrolyte solutions. A physico-chemical interpretation is given to the behavior of Ev and B with pressure from the view point of the water structure.