Structural components and characteristics of WDG - 5 type microwave freeze dryer were introduced, and the causes of uneven drying were analyzed. The experiments about the influence of microwave control methods on the drying uniformity were conducted on this dryer using the material of carrot. The results concluded that out layers of 20 material plates were dried faster than inner ones. Compared with the whole working method of microwave system, the two-group alternative working method evidently improved the drying uniformity among plate layers. As for the materials within the same layer plate, peripheral materials were dried faster than central ones. And the drying uniformity of the same plate materials was also improved greatly under the two-group alternative working method of microwave system in contrast with the whole working method.%利用WDG-5型微波冻干设备试验分析了影响干燥均匀性的因素,并试验分析了该设备的微波施加方式对料盘间、料盘内物料干燥均匀性的影响.试验表明,微波冻干过程中20盘物料外层干燥快、中间层干燥慢,微波交替开启方式与整体开启方式相比,可提高料盘之间的干燥均匀性；干燥过程中同一料盘内物料呈现周边物料干燥快、中心部位干燥慢的趋势,微波交替开启方式与整体开启方式相比,能明显改善同一料盘的干燥均匀性.
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