In This work, an exergy analysis is performed for the waste heat recovery section (WHRS) of the steam-natural: gas reforming (SNGR) process as a major energy intensive process. Two alternate conditions are investigated to evaluate the required thermodynamic parameters: normal operating condition and increase of C-2+ components in the process feed stream. At normal operating condition, the exergy efficiency of WHRS amounts to 0.58 while some 17:2 kJ energy is destructed for each mole of H-2 produced. If heavier than methane components are increased in the feed up to 8.5 mole %, despite the increase of H-2 production, the exergy efficiency decreases down to 0.54 and exergy destruction is reduced to 13.8 kJ for each mole of H-2 produced. It is concluded that waste heat recovery has an important role on the exergy parameters of steam reforming processes, and an efficient heat,exchange mechanism should be designed for this purpose. In addition, a change of reforming feed composition has a significant effect on the process efficiency, which implies its control for an efficient operation.