In order to discuss the transport phenomena in dense gases, a generalized Enskog's equation is suggested. We notice that the correlation function Y(r) can be obtained from virial expansion of the equation of state.In this paper, formulas for calculating viscosity and thermal conductivity for dense gases of molecules interacting with a square-well potential are derived. Using these formulas, we have calculated the viscosity for argon at temperatures 173 K and 348 K and the thermal conductivity for argon at temperatures 183 K and 348 K. Comparison of theoretical results with the experimental measurements shows that the agreement is good and is better than another theoretical calculations made so far.