Abstract: Based on the first and second laws of thermodynamics and the theory of non-equilibrium thermodynamics, a new systematic approach to studying the exergy transfer processes of forced convective heat transfer through a duct with constant heat flux for fully developed turbulent flow was introduced.The local and mean convective exergy transfer coefficient, exergy flux, exergy-transfer Nusselt number were defined and the equation of convective exergy transfer rate was developed and their new generalized expressions were derived.By reference to a smooth duct, the numerical results of exergy transfer characteristics were obtained,and the effects of Reynolds number, non-dimensional heat flux and different cross-sectional locations in the duct on exergy transfer process were analyzed.In addition, a comparison of the results of exergy transfer with that of energy transfer was also discussed.