Microwave-convection drying includes two kinds of form, one is microwave and air convection drying conducted in stages, the other being these two drying carried out simultaneously. In our study, the second form was adopted. In microwave combined convection drying, microwave energy removes the inner moisture of material to the surface and convective air helps removing the surface moisture out of drying chamber, which not only increases the energy efficiency but also reduces the surface temperature of material. Intermittent application of microwave energy has proven itself a good method to avoid uneven heating, improve product quality and increase energy utilization by allowing redistribution of temperature and moisture profiles within the product during off times (Gunasekaran, 1999).