Abstract: The energy system of a monosodium glutamate producer was classified into three sub-systems (three links：energy-conversion link, energy-use-link and energy-recovery link) based on the three-links-model for process energy systems in this paper. The three-links-model (including physical model and mathematical model) for the monosodium glutamate producer energy system was established. Global energy and exergy analyses were completed for the monosodium glutamate producer based on the “three-links” model, and the energy efficiencies of the three-links of process energy system was given respectively according the analyses results. Some factors that caused low energy efficiency and high exergy loss were discussed and analyzed. The monosodium glutamate producer has enormous energy savings potential.