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Pulp and paper production industries are known as a renewable energy technology. In this research, exergetic analysis of pulp and paper production is presented. The system performance is evaluated based on the data of Pars Paper Industrial Group (PPIG), Iran, which is given as an illustrative example. An exergy destruction as well as exergy efficiency relation is determined for each section of the system components and the whole system to indicate the largest exergy losses and possibilities of improvement. It is found that the largest exergy losses occurred in the steam plant and soda recovery and these sections are highly exergy inefficient. Further it is observed that with decrease of excess air and preheating of inlet air the exergy efficiency of boilers is increased