提出冷冻干燥升华过程主要由传热控制和传质过程两阶段组成．分析认为升华过程是传热传质的逆过程，并得出该过程的合理工艺条件，即物料表面的加热温度和干燥箱内真空度的变化规律 Proposed freeze-drying sublimation process mainly by the heat transfer control and mass transfer process of two phases. The analysis shows that the sublimation process is the reverse process of heat and mass transfer, and the reasonable process conditions of the process are obtained, that is, the change rule of the heating temperature of the material surface and the degree of vacuum in the oven