Shear viscosity eta(shear) and diffusion coefficient D for a classical fluid are investigated for two- and three-body intermolecular forces for a square-well fluid based on the time correlation function described by Smoluchowski equations. Square-well fluid has two important parameters well-width and well-depth. We have investigated the influence of two- and three-body intermolecular forces oil shear viscosity and diffusion coefficient on well-width and well-depth of square-well fluid. (C) 2009 Elsevier B.V. All rights reserved.