— A system for continuous microwave sterilization of foods packaged in plastic pouches has been designed, constructed and tested. Air pressure was used to prevent pouch rupture. Pouches containing food for use in military rations were sealed and introduced through an air lock on to a conveyor inside a plastic pipe within a microwave cavity. Microwave energy was supplied up to 10 kw at 2,450 MHz. Conveyor speed and power were regulated to provide the process time and temperature. Cooling was achieved in a cooling bath. Pouches were overpackaged in a foil laminate for additional protection. Several food products were processed. Total process times of 9–14 min were achieved.