In order to improve the energy efficiency of medium density fiberboard（MDF） manufacturing,the heat energy and exergy utilization during the conventional and low temperature fiber drying processes were compared.The results showed that heat energy utilization efficiency during the low temperature drying process was higher than during the conventional process.The specific heat energy consumption was lower in the low temperature process than consumption using the conventional process.The authors also found that the low temperature process exergy efficiency was higher than with the conventional drying process.Finally,some suggestions for saving energy during MDF production were provided.